1. Besides the obvious design flaw when I was unable to have the whole “set up your PIN” table on my screen, my Suite has a permanent great big red banner “! You were disconnected” across it. I get the same whenever I click on the Trezor pages as well.
How can this be considered normal?
It's not... there is something wrong with your system. The fact that you get "you were disconnected" banners on both the Trezor website
and the Trezor Suite application tells me that there is some weird networking issue that is causing communication problems between your PC and the Trezor servers.
Possibly a DNS related problem or your net is being "censored" in some way (ie. ISP, or router or firewall, or windows firewall or anti-virus/anti-malware is blocking connections)
It seems this "you were disconnected" issue was already reported by at least one other person and investigated by the team:
https://github.com/trezor/trezor-suite/issues/2497However, they were unable to replicate.

Unfortunately, I suspect that this is a problem on your end... as I am not able to replicate this "you were disconnected" banner, unless I actually disconnect my internet (disable WiFi and/or ethernet etc). However, when I restore the net connection, the banner disappears.