Bun is supposed to be a drop in replacement for node and it can work like that for many apps currently as far as I know.
So it only comes with and will come with improvements.
At scale it could potentially save a lot of money.
Sounds like it will help with developer experience too so.... I can't tell why you hate it.
Personally I think deno and bun will find their space (which may overlap over a lot of space that node currently takes) and their existence is a net good.