[nicoburns]

The key thing for me is that old API is not deprecated, and the React team have publicly stated that they intend to maintain it indefinitely (and indeed are still updating it to work with newer React features).

At $DAYJOB we have no intention to rewrite our older class based code to hooks (except where we're otherwise making significant changes to that bit of code), and indeed we're still writing some new code in the class style.

If you feel like you need to upgrade then I think that on you, not the framework.