The problem is that most of the backlash from the OG fandom (not even a correct way to call them btw, since OG meant people who were in the fandom 2006-2009 before it blew up, now it means whoever played SR1 or SR2 regardless if they did it in 2006 or 2020) comes over story. The fact that they changed one aspect in a way that's more commercially and critically successful is not enough to create this big of a divide. I am a fan of Resident Evil games, and those games have an even bigger divide in style and genre than Saints Row does, yet when Capcom makes the game I don't like, I simply don't consume those products. I still don't consider myself an "OG RE fan" because I don't like the direction of RE7 and RE8. I just consider myself a Resident Evil fan.
There's nothing wrong with having a preference, until SRR's announcement I was heavily on the side of older SR games too, but there's a difference between preferring one direction, and straight up harassing anyone who doesn't agree with your opinion of what's "the one true Saints Row", and arguing how you're the only person that deserves to be pandered to just because you're the "OG" therefore more entitled to the pandering. All it does is create a toxic environment in the fandom that makes it unappealing to the newcomers.
I think the divide is artificial at the end of the day, this is still the same series, and the game is defined by the same features, and we can all sit together and enjoy those same features, just like in any other fandom. If story is the only thing that make SR an SR game for someone, and seeing anyone else enjoy other aspects makes you furious, then they shouldn't be a part of the fandom. We can talk about some many cool features all SR games have in common (open world, sandbox gameplay, awesome mission design, character customization, etc.), but instead we fight over whether SR main characters should wear baggy pants or not, which is silly. I never called anyone who enjoyed RE8 a shill or a fake fan because I prefer RE4's direction, I just let them enjoy their games in peace while I enjoy mine.
After all, nobody's forcing anyone to buy any of the games. You can still enjoy a specific game in the series you like and that's okay. That's okay for every game that was ever made. It doesn't make SR fans special in any way to like only specific few games in the series than it makes me to like only a few Resident Evil games.