Just one observation, and one that is rather easy to explain. In summary: WRPGs are more complex than JRPGs, and therefore have a much bigger bug surface, and as a result are typically buggier.

In particular, we can look at various types of bugs:
* Game mechanic bugs: Sometimes the game's mechanics are coded incorrectly. For example, the game may be coded so that blindness increases the chance of an attack hitting, instead of decreasing it. (Two examples: SaGa 1 (for basic STR weapons only) and Morrowind.) This type of bug can be found in both CRPG subgenres, and is in fact found in both.
* Quest progression bugs: Here we start to see some differences. JRPGs are typically linear, to the point where some of them even have a single variable that describes game progression. Hence, there's only one path through the game that the developers have to test. This is not the case in WRPGs. There's also other factors; for example, what if a character who the game is expecting to be alive is killed earlier by the player? In a JRPG, this can't happen, since NPCs can't be interacted with that way outside of combat, and they don't even have stats. In a WRPG, however, the situation is typically different; every NPC has its stats, and can be killed unless the developer has made them unkillable (and quite often the developer overlooks some way of doing so).
* Memory bugs: In a JRPG, typically the amount of space used by the game can be reasonably bounded, as the game doesn't have to keep tracks of large amounts of information. For example, the stats of NPCs do not need to be stored in writable memory (and, in particular, don't need to be saved) unless the player is in combat (where saving is normally not possible anyway). In a WRPG, however, the game needs to keep track of the state of all NPCs, not just those involved in combat; this includes things like inventories, the NPC's health and status conditions, and disposition toward the player. WRPGs also typically allow the player to drop items on the ground and then pick them up, which is another thing the game needs to keep track of. This results in WRPG save files getting bigger as the game progresses, and also makes them more prone to memory bugs. (I *have* seen memory bugs in JRPGs, like with 64 stair bugs in earlier Final Fantasy games, but they're not as common and are generally less random.)

So, in summary, WRPGs, due to being more complex than JRPGs, tend to be a lot buggier as a result.

Anyone have any thoughts?

(Also, please don't downvote without comment.)

I think it has more broadly to do with western games in general having a lot more shit to do whereas Japanese games tend to be focused on a very narrow vision that they polish as much as possible. Like I'm playing through Crysis at the moment and that game can be straight eurojank at times because it's trying to shove all sorts of graphics and physics in big open maps with vehicles and explosions.

Maybe because you're comparing apples to oranges? Most wrpgs are PC games, while jrpgs are consoles games. Up until recently Nintendo/Sony had standards, but recently they have opened the floodgates, and shit games are more frequent on Playstation/Switch.

Also, why are you posts increasingly click-baity? The world might never know.

Probably because WRPGs tend to have more complex quests with multi endings and so on, so there's more chance for scripting errors because of all the moving parts, while your average JRPG quest is kill 10 boars.

WRPG-s are just better those jrpg-s more like a copy of each other obviously much more easier to make them lesss buggy

Not sure. As mentioned before you have come up with this notion of “W” RPGs which appears to throw anything that isn’t Japanese based into one category and then expect to compare them to your preferred style.

No. You already wrote about everything - more interconnected gameplay mechanics, non-linear story and character customization that result in complicated interactions during the walkthrough. All that creates more possibilities for bugs and thus more bugs.

I would add: The platform. Most WRPGs are made for the PC. And PCs have a multitude of different hardware and software lineups. Coding for every possible situation is often nearly impossible and with that the amount of bugs one experiences is often very different from player to player. The amount of bad PC ports of those JRPGs that were console first is surprisingly high. And with those, people complain about bugs, bugs and bugs as well.

May have helped had your opening post been drafted as a question or a discussion rather than a statement...

I actually haven't thought of this in regard to western non-RPGs, except maybe for genres that are inherently complex, like simulation games. I'm not saying one style is "preferred"; just that there's a trade-off here. The more complex a game is, the more buggy it's likely to be, and WRPGs are more complex than JRPGs.

(Also, there exist non-Japanese JRPGs, like Costume Quest.) It's worth noting that the *type* of bugs you find are different. PC JRPG ports don't generally end up with specific quests being broken, or new ways of getting softlocked; rather, you end up with poor performance or outright crashes. (Well, and sometimes bugs not being fixed; Final Fantasy 7 PC still has that bug that lets you duplicate items with W-Item.) No, neither genre is inherently better than the other; there's just some trade-offs involved.

(One corollary is that WRPGs would likely be more expensive to make than JRPGs of similar scope and production quality.)