Performance is not one thing, we have processors from so small they can almost not be seen to gigantic AI chips. RISC-V made some design choices and some people

Performance is not one thing, we have processors from so small they can almost not be seen to gigantic AI chips. RISC-V made some design choices and some people like some of them and some people don't like others, just like with anything else in the world. Christopher Celio as part of his PhD did ISA comparison and found no way that RISC-V is systematically worse, in fact in many situations its better. David A Patterson, Dave Ditzel and many other long time engineers in this space seem to really like it. And btw, you could make a much longer The Good, The Bad, The Ugly list about ARM as well. By that definition no ISA is well designed.