Earlier quoted context omitted.
If React is so great how come Amazon isn't using it in their store? I think last year an Amazon frontend engineer wrote some tweets explaining they tried React and it was too slow. So they keep using Java for SSR and sprinkle vanilla JS. They were still using jQuery until a couple of years ago and probably still are in some parts of their site.
Because Amazon Store is and aleays was an armpit of webdesign? It's the worst designed e-commerce site and decades of tinkering only brought it half way towards basic level of decency that was obvious to a beginner web developer making their own first e-commerce site from scratch in PHP 20 years ago?
The Amazon site is pretty ugly, yes, but it’s functional and fast.