.NET has been on Linux for years now. And my company is using it in production on Kubernetes (Linux/Debian). Its crazy how dependable and fast it is. Startup times are amazing and its only getting better each year. We're looking to upgrade to .NET 6 in production by January.
Have you even seen the benchmarks compared to Java and other languages?
https://www.techempower.com/benchmarks/#section=data-r20&hw=...
If you're not paying attention to .NET its time to get your head out of the sand, seriously.