>PNPM and bun are fast enough that the increase in development velocity is worth the occasional rough edge IMO.

If the speed of your package manager is causing issues for developer velocity you have much bigger issues to contend with. And I categorically reject the statement that either of those are meaningully faster in any way. Maybe you can point to some specific obscure benchmarks that have slightly smaller numbers. But all of that goes out the window the second a dev is stuck with one of those "rough edges" even once. Not even to mention the lockin you've achieved on the tooling front now that your entire stack is nonstandard and reliant on a single highly specific list of dependencies to work, which may or may not even be kept in line with their node/npm counterparts.