I recently switched to esbuild and I am delighed. My build time dropped from 30s to 2s and I was able to remove a lot of dependencies. So IMHO they need to continue producing these stuff to push the innovation forward.
I actually went nuclear on a large rails project and migrated it from custom rails 2 fork to rails 4, it was a mess but we're glad we made the whole deal once instead of migrating slowly to 3.0, then 3.2, then 4. It took ~ 6 months as well.
Cloudflare is not having any issue, it's just used here as a proxy to help with caching and static files. The real server hosting the application is down.