> All the big companies are using Java and Go almost exclusively for high volume endpoints

Please cite “all the big companies.” Also exclusively? No seriously, that is a bold claim. Google isn’t one of them because most of those hotepots are still written in C++. I don’t know how you can claim this. Based on some occaion company blog posts, changing just one or two endpoints out of say 100?

What about Rust? I also know companies rewrote some hotspots in Rust too.