I stopped buying Samsung after two phones. About 18 months or so after I got them, some update would make things so slow I needed a new phone. Second time I figured it wasn't the phone being old, it was the update slowing it on purpose.
Other phones I've had don't seem to have this problem, updates seem to not change the speed of the UI at all. But I also don't appreciate the customised Android, there doesn't ever seem to be a benefit.
My Note 8 is going on a lot of cycles. Have had it for too long probably. Battery still holds up solid.
Older device, Note 5 had a 5 percent warning. Battery went to crap quickly.
Avoiding the fast charge helps too. I use it when I need to and just go normal otherwise when I am not time constrained.
No charging port trouble. Wireless charging just works.
Recently, I got a battery back. Doing it now before I really need it. So far, a year in and a lot more plug in charging and I cannot recommend one more highly.
I find I can often run the phone off the back and pretty much never have to allow a deeper discharge.
Battery time leveled off and is in a very, very slow decline.
YMMV, of course.