I've used one of my game projects, and here's why I don't want to use it again:

- You're locked into an online IDE if you want to use the PlayCanvas editor (which is the main selling point).

- Third-party dependencies are hard to integrate (for the online editor).

- You can't use different JavaScript languages (again due to the editor).

- I've seen lots of minor version changes that break too many things (not very stable).

- The editor had some major UI bugs back then (and probably still does).

Pros:

- Web-first library.

- Unity-like editor.

- Easy to debug/access things with only a link.

- Recently started to support WebGPU.

I've used ThreeJS, PlayCanvas, and BabylonJS in serious projects. I've concluded that BabylonJS is my go-to web-based 3D library from now on.