So if I'm reading https://dotnet.microsoft.com/en-us/platform/support/policy/d... correctly, 7 is an STA release and support for it will end before support for 6 (LTS release) ends?!

Seems like the only reasons for upgrading from 6 to 7 would be an easier path (possibly) to upgrade later than going from 6 to 8, or if you really want to use something in c# 11 (https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/cs...) . I remain unconvinced...