Why would you say that? It’s an archaic framework which sticks around because it’s “good enough” for anything with a complexity low enough to be handled by its “magic”. As soon as you need something to scale or handle real complexity where you have to step outside all the comfort zone .net developers tend to operate in, it’s one of the worst frameworks that will constantly get in your way.
It’s also an ecosystem riddled with traps that is still so stuck in its OOP past that very few programming languages operating on it are even capable of having functions without a class object.
Don’t get me wrong. It’s a good language when you’re building relatively simple backend APIs that are small enough that they can actually use things like entity framework. Even more so if you’re putting them into Azure and letting your security be handled by EntraID.
This may be your personal experience but it is used successfully and happily by many in a variety of domains way different to "boring OOP back-ends". No popular general purpose language is confined to a single scenario the way you describe (even Swift and Kotlin are expanding). C# lets you do things like writing a competitive Redis implementation[0], advanced physics engine that beats Jolt[1] or a game engine that does not rely on C++ or C[2], cross-platform applications[3] and so on and so forth. It is possible to successfully do both high level FP style approach for business domain modeling and very low-level data crunching that is competitive with systems programming languages.
My personal opinion is a little more blunt than that. In my world C# developers are typically people who are attaching wall anchors with the hammer function on their power drill because they can’t be bothered to pick up an actual hammer. It works, but it’s not a good idea. Like I said. I think C# is a good language for a lot of things. It’s just that it’s often also the wrong language for specific things. If I were to use a “power drill” for everything I’d personally pick Typescript but it’s not like that would really be a better idea.
This being HN, however, most people here are more prone to actually go pick up the hammer.
