1. Should we include jQuery Slim in next 8.2 release?
2. Evaluate to load jQuery standalone & slim version conditionally (Roughly idea, only load jQuery standalone if any ENABLED modules registered jQuery standalone as dependency lib)
3. Evaluate & Refactor Ajax System to adopt any Ajax framework
4. Evaluate & Refactor jQuery effects to CSS based. (Basically, I think we've already preferred CSS based anime but we do not have any actions yet)
5. (add your idea)
In my opinion, Point #3 & #4 are must-do.
User interface changes
Data model changes