Shrug. They're fine. It's not hard to ignore that stuff. Honestly Apple's constant iCloud storage notifications are more annoying than pop-ups in the Galaxy Store you'll probably never visit anyways.
Galaxy Store is the only way to update several essential packages on Samsung devices, they don't publish everything on Google Play.
But you can update through the app instead which skips going through the front of Galaxy Store. That's what I've always done anyways.
That works to some extent, but there are packages which don't have a UI from which to check for updates, so you could end up with some services becoming outdated and broken, or just vulnerable.
My s21 updates all the system apps itself, I don't remember the last time I had to go into the galaxy store to do that.