I have, in a previous age, unfortunately been the first one to suggest react at work. it’s declarative! the mental model makes sense! it’s kind of like functional programming! why, Facebook is surprisingly good at CS, maybe we should look at graphql too since that seems like such a good fit for react
this venerable house, opulent and imperial, is a festering abomination. as soon as you run into any performance issues or edge cases with react (or far more quickly with graphql, where the edge cases include shit like authentication and API versioning), you’re going to start burning out developers doing the most counterintuitive bullshit ever invented to torture a development team. and react is structured such that performance issues will accumulate in web apps; it’s just a matter of time (and not even that much time) before they do.
that’s why the advice now is to dodge performance issues with server-side rendering, almost like your site should have been fucking static html in the first place, except SSR won’t fire up without a gigantic bundle of JavaScript affixed to it, and in general it’s another source of bugs and weird performance regressions that you now have to debug in two places
and for what? react’s DX is better than HTML and CSS until you hit a wall, then it’s much worse. you can get a fairly react-like set of functionality out of plain HTML with Web Components… except Web Components requires fucking JavaScript for no reason but to not threaten existing frontend frameworks (see our sister community FreeAssembly soon for the gigantic rant and JavaScript library I’m writing about this shitty situation)
you know, for as much poison’s been poured into my ear about how everything must be Amazon scale, there’s no way in fuck they use react for their storefront or AWS, is there? I think the only reason react is considered an Amazon-scale frontend (besides Facebook, which also has a shitty UI, though not as bad as Amazon, and notoriously uses PHP for everything) is how hard they push it as part of AWS Amplify, a toolchain they say will help you reach their scale (but from experience: it absolutely will not, it’s just a set of technologies that increase your AWS bill and perform like shit, which is why Amazon doesn’t use it for anything of value themselves)
the only case I can immediately think of of a very major site going from server rendering to react is GitHub (which used to use Ruby on Rails and Erlang, apparently) and it’s been an unmitigated disaster — none of the new features that supposedly require react are good, the performance fucking sucks now, and the thing keeps breaking (I get weird renders with broken styling every few refreshes and apparently I’m not the only one). the fucking thing even hijacks the keyboard shortcuts I use and has become an accessibility nightmare, all in the name of pointlessly turning it into a react SPA and vscode wannabe.