There are real benefits to be gained though from new compilers. Look at "Circle" by Sean Baxter as an example. Outside of supporting a powerful form of compile time computation and allowing things such as reflection and writing shaders directly in C++, benchmarks have been floating around showing that it compiles quite a bit faster than GCC and Clang whilst still being able to compile big projects such as Boost. Although LLVM is the backend, the front-end is written from scratch by one guy.

https://www.circle-lang.org/