Glad you’re doing these. The IAP one already saved me from a migration I’d been dreading.
If you’re taking requests, DOTS/ECS is the one I’d push for hardest. The learning curve is brutal and the Entities API keeps shifting between versions, so it’s a constant time sink. I don’t think a full “turn my project into ECS” button is realistic since good ECS is really a data-layout decision, not a find-and-replace. But even just the mechanical side would be huge: Burst/Jobs boilerplate, bakers/authoring, and surviving the Entities breaking changes whenever you bump the package
A few others that fit the same mold:
- uGUI to UI Toolkit, converting Canvas setups to UXML/USS by hand is tedious and custom editors are worse
- Input Manager to the new Input System
- Built-in to URP/HDRP
DOTS is the one I’d actually use first though