Comment by chaosharmonic

Generally, a bunch of batteries included out of the box, in which I don't have to care about installing and configuring a toolchain full of third-party deps in order to do stuff like formatting or CSV imports. (Yes, I'm counting the JSR stdlib when I say this. I did say "third-party." This isn't, and in fact it is intentional about being cross-runtime where possible.)

Not needing to have opinions about the details has been one of the most freeing things when working on a project, even if it now means having a slight opinion about not wanting to use npm anywhere that I don't have to.

I realize at this point Bun offers a lot of overlapping "Node-like but with lots of extra niceties." But I happen to like that this one is actively trying to contribute stuff back to the core ecosystem -- the stdlib, initiatives like WinterCG, infrastructure like JSR (which is open source and at least a little bit more resistant to consolidation relative to npm)... Instead of just trying to extend it with a kitchen sink full of first-party features.

Like others here said, I don't think it's just one thing.