Yes, you the developer. I think that’s his point. The performance if react sites is another thing and that’s what the user cares about. It also doesn’t work on mobile. React native was worshipped and now is thrown out.
Most importantly, it’s also not particularly performant on the client side in real-world scenarios.
For evidence, here’s a guy testing major websites using his awesome react-scan tool: https://x.com/aidenybai/status/1861442057598062653