If you're not an app that's intentionally risking your users' safety though, you probably have some reason to trust the ad vendor to do their part. It's calculated risk for most non-malicious apps, and the major vendors are broadly fine in that respect. Ignoring privacy anyway.
And we can ignore the shovelware, which probably is actually a majority of apps. Those won't care about security patches, and will probably go out of their way to hide them so they don't appear vulnerable and don't have to do maintenance releases. They wouldn't be affected by forced updates.
So as a conclusion, it seems we agree that those that are the ones creating most risk for users will not be impacted.
I am sticking to android ecosystem as best one I know, because I still have choices + I can use fdroid for a lot of my apps.
But when my mom uses a tablet or phone
... I have absolutely no smart advise to give her. All apps are hostile and annoying. The play game subscription is fine (apps/games cannot have apps and are fully unlocked) but other that that play store is a minefield.
And we can ignore the shovelware, which probably is actually a majority of apps. Those won't care about security patches, and will probably go out of their way to hide them so they don't appear vulnerable and don't have to do maintenance releases. They wouldn't be affected by forced updates.