Is your project an internal app or public?
I'm cautiously optimistic about Blazor Server but I'm not sure I like the sticky SignalR requirement. The expectation seems to be that the backend server will keep around a lot of state (cough viewstate?) in memory associated to that session. It's a very convenient dev experience for sure, but it seems difficult to scale beyond internal business apps.
Not quite sure how it works beyond that when you need multiple service instances connected with a backplane. The new premium tier I just saw sounds convenient though.
https://azure.microsoft.com/en-us/pricing/details/signalr-se...
In pragmatic terms, .NET is as native as anything else in Linux at this point.
You can even build it from source: https://github.com/dotnet/dotnet
In fact, the VMR ( linked above ) ONLY works on Linux at the moment with Windows and Mac support planned. So, .NET is Linux-first in some ways.
MAUI is not Linux first of course. The rest of it is becoming more and more Linux and container focussed though it seems.