Bun is pretty cool.
I maintain a Node.js library and updated my Node.js engine version and my library just didn't work on the latest version... In frustration, I decided to try Bun for the first time... I had never used it before but my library worked straight away, no warnings, no errors. I have never seen that level of compatibility before when a library works better with an alternative engine than the one it was designed for.
I did end up fixing Node.js compatibility later but it was extra work. Felt like they just created busy-work. Node.js maintainers should stop deprecating perfectly good features and complicating their modules.