All else is never equal. The level of adoption and support is what drives decisions in the end. That's why everyone still uses Node when Bun is probably better in every way.
Also I shouldn’t have to say this but all of the current JavaScript applications have already been written. Switching a large production codebase to a new framework does not dovetail well with modern dev practices, amplifying the pain of doing so.
I don't think application developers are the main target for their product. OTOH, if AWS/GCP/ETC. adopted Bun transparently to run your cloud functions faster and using less resources (thus less $$) that would be a win/win situation for all parties involved.
All else is never equal. The level of adoption and support is what drives decisions in the end. That's why everyone still uses Node when Bun is probably better in every way.