Having the same issue system ui was just crashing throughout the next day, then controller stopped working for CODM, now can't copy and paste any thing if I try app will close, can't open Gmail, chrome, chrome beta, my banking app, Bible, Internet they all crash, when I try to report the crash, the app meant for that crashes. Cleared cache n all still ain't working had to get an extra phone. Phones completely useless
So now we shall see what Samsung ends up not doing...
I have got s20 plus and always thought it would be possible to install on it custom nougat, yup I wanted to go backward at first but then found out I can't I can just go up ! . And so I thought newer better well my s7 edge which I still have boots way faster than my s20 plus. When in idle my s7 edge cpu usage stays at 0 or 1 percent. While my s20 plus on stock android 11 uses 5 to 10 percent of the cpu in iddle.
You did the same mistake I did don't upgrade to 11 rather stick with 10. Newer rom from Samsung means more crapware more telemetry Spying control and difficulty of removing apps you may not want..and after you do upgrade you won't be able to go back to earlier version
Since I bought my first Samsung I have always used SwiftKey keyboard way better than gboard or sboard
As to chrome I use bromite and kiwi, try it and see the speed difference bettwen Chrome and bromite and kiwi.
If I was you I would learn how to install custom recovery and rom for your phone that's what I did. And that's the only way of making my phone work and be able to have at least some control over it .
I do use my phone for banking and shopping a lot. Imagine for many years used my s7 edge custom rom on it custom recovery no Google crapware no Samsung crapware and never ever had one security issue.
The same goes for my Windows 10. No defender no firewall no antivirus as I removed all packages I didn't want before installing windows on my pc and guess what ?Never ever had any trojan any virus or any security issue.
To average phone, pc, users the only security, privacy and virus threat are posing companies like Samsung Apple Microsoft.
S20 plus is the last phone I have bought. Next one will be something else not sure what yet.