While I call them major updates, it's more just, me trying to differentiate them from the little hotfix updates and such that I do when bugs are found or stuff doesn't quite feel right (Balance issues typically). Each update is basically me introducing a new feature, and the paywall is in part there so that I can try and fix bugs on it before the public release, and in part just, well, trying to give people something for supporting me with working on this.
At the very least, I can assure you that I'll never do that kind of terribad thing as described in the latter paragraph there. The moment bugs are found I do the best I can to fix them and get the update out, and I fully intend to keep doing that going forward. Hells, if it means pushing forward a public release of a patreon version because that's where it's fixed, then I'll choose that over having it be broken for people. (Though I should hope that it's never in such a state of disparity between them that it would be a possibility.)