It's based on a setting originally intended for tabletop play, it's literally made to be built upon.
This is the fandom that sent Jess Henig so many death threats that he was afraid to open his inbox for years, just because he oversaw the writing of Mage 3e. They worship their headcanon and will rip you in half if you dare to violate it. That shit drove me out of the community years ago and after glancing at the V5 debacle I’m gladder I did. As far as arguments go, this is not a good one. Even if the tabletop scene wasn’t a dumpster fire, it’s still an irrelevant argument to make.
Ultimately, we have no idea what Troika intended. The game was released in an unfinished state with a rush job. Unless Paradox spends a ton of cash to reassemble as much of the original team as they can to remaster and finish the game, which is never gonna happen, we will never know what their vision was.
In any case, I find it very strange that Wesp has continually worked on patches since 2007 with no signs of stopping. You say yourself that he spent more time on the game than the original development team. No game can possibly be that buggy that you spend more time fixing it than making it. Wesp could’ve made a new game, several games, with the time he spent on these patches. I can’t imagine spending over a decade of my life making patches when I could make my own games. That’s ridiculous.