tremere110: I think it's just a number. I mean Terraria was 1.0 ages ago but the game it is now barely resembles what it was originally with all the stuff that was added since then.
Project Zomboid would a quality full release if it was changed to 1.0 right this instant. But what would it change really? It's just a number.
I agree with you that a number is just a number. Still, numbers, like words, have a meaning. 1.0, in this case, would mean the game reached a point where it is fully functional and has all the features the devs defined, that make it a "Gold", good-to-go version. I've read the subforum In-Dev Q&A with Indie Stone, and the game is far from including half of those promised features.
You can (and should) keep working on a project after it reached 1.0. Like Terraria, the example you gave, or a number of others (Kerbal Space Program, Slime Rancher, The Long Dark, Starbound, for instance, to name a few). But you are dealing with paying customers, and until you release a 1.0 version, you're technically selling an unfinished product -- as good or playable as it may be. I work as a publisher/editor in a small book publishing house. We can't just sell a "work in progress" book, as much quality as it may have, because the readers will feel scammed into buying an unfinished book. We can only sell the finished version, the "1.0", if you will. If the author wishes to revise and add to the book after release, you try to accommodate, and readers have access to the new versions of the books, the "post-release patches". But there's always a sense that you're not being wronged into buying something that's not done.
Why do Project Zomboid and Indie Stone deserve sheltering and standing up for, when other studios and games (and Early Access, in general) get criticized for much less? When a game spends years in Early Access, it's labelled as anti-consumer right away, a scam by the devs, in utter bad form. But Indie Stone, apparently, can get away with whatever they do, because... what? Their game is the best thing since sliced bread? This practice is not doing themselves any good, either; I just did a quick google search on them and their precious game, and LOTS of people seem to have the same issue as me, and it's been happening for years. It's great that you have a vision and you work on it, in order to achieve it. Owlboy took ten years to make. Iconoclasts was an 8 year project of a single individual. But when you got to buy the games, they were done, it was the basic product the devs felt happy with and wanted people to enjoy. If Project Zomboid is so great and in such a great shape and form, release it, then.
It is just a number, but it's not just a number. It's a principle. A word that gets thrown back and forth in these forums a lot, but only when it suits some people, apparently.