It was changing quickly in the earliest releases, about 10 years ago. Like one day I pulled our repo and there was new "?" syntax, but that was a feature I'd been wanting anyway.
Edit: Oh, async/await was a bigger and more recent one, 2019. I've heard that this wasn't an easy decision for them but was kinda needed.
A few years in between releases with a sane versioning system seems fine to me. If you don’t want new features don’t build with that new toolchain.
It’s not javascript where you need to support all possible browsers.