I'm an experienced C developer and I wouldn't say this. I'm pretty meticulous, I use as much tooling as I can, and I've still written over/underflows, memory corruption, threading heisenbugs, double frees, NULL derefs, etc. etc. etc. My defect rate has gone way down over the years, but that's probably 50/50 experience vs. an attenuation of my ambitions.

I think the proof is in the pudding here. I can't imagine using a messaging client or an email client written in C, and also there isn't much that is written in C anymore even if I wanted to: you're looking at Swift/Java/Kotlin/TypeScript/JavaScript/C#/Vala/Dart/Rust/Go, and maybe C++.

Is anyone writing production servers in C these days? It feels like they're 100% Go and Rust.

There are notable exceptions, in particular I'm thinking about OpenBSD. I think OS dev is a pretty niche area though, especially when you're talking about OpenBSD's wide platform support, so I think it's more the exception that proves the rule than anything.

That is true. I'm repeating what others have judged and told me.

Of course, feel free to judge for yourself.

This could be true if you consider survivor bias.