Like all languages, C#, Java, etc have cargo-cultist developers who use them badly, and in the case OOP languages, doing things like overdoing the separation of concerns.

However, speaking as someone who actually uses C# day in and day out and understands the trade-offs of different levels of (or even no) separation of concerns, it's not done for us to "feel" good.

On very large projects running for a very long time with many developers coming and going with varying levels of competency, an appropriate amount of separation of concerns and decent "plumbing" can be the difference between a code base enduring decades or becoming essentially unmaintainable due to unchecked entropy and complexity.