Honest question, what isn't compatible? Where I work we've simply replaced node with bun across a lot of overcomplicated + crappy projects, and on my work+personal computers I alias bun/bunx to node/npx with seemingly no issues at all

I expect bun to run almost everything that node runs these days. They have an extensive test suit to ensure that.

Even the complicated NextJS runs with Bun: https://nextjs.org/conf/session/nextjs-bun

Do you have a source for your claim?

In my testing Bun wasn't much faster most of the time, usually on par for all non-IO related stuff, and there were some cases with scheduling where Bun was noticable slower.