Unity is special and has its own API and popular patterns, if you block the main/render thread it will explode, regardless of the language of choice, and Erlang/Elixir performance is not acceptable for Gamedev and will likely stumble upon similar issues.
Again, and I cannot stress this enough, we're discussing somewhat niche feature. You have to take into account that even the standard library still has a lot of semi-blocking code, simply due to the nature of certain system calls or networking code. From runtime standpoint, blocking or computationally heavy logic - there is no difference, it will scale the amount of threads to account for fairness automatically. It's that blocking just has extra cost due to being "better" at holding threads (you don't have to think about it). .NET 6 is just comparatively better at dealing with such scenarios but your app would work fine in PROD 9 times out of 10 with invalid code before or after that. It's a difference between running 'Task.Run(() => /* use up thread for no reason for seconds / minutes */))' in a 100s iterations loop going from terrible to very bad.
It's pointless to "fight against words". Just trust the runtime to do its thing right. That's why its baseline cost is somewhat higher than that of Golang or Rust/Tokio - you pay more upfront to get foolproof solution that has really good multi-threaded scaling.
If you don't want to believe the above, just look at average C# solutions on Github. There are no "special magic to learn", that's just how people write code new to the language or otherwise.
p.s.: This situation reminds me one of my colleagues who would always come up with an excuse for his point regardless of context. It's counter-productive and self-defeating.
