Illustrator has never supported Photoshop’s scrubber. Of course it would be a good idea, which is why Adobe has not implemented it. They are allergic to good ideas.
Yes, rather than being competitive within Adobe across product lines, they should be sharing and incorporating the best and make common GUI to make everything more easily used.
Compete across dept.s for new ideas; then adopt good ideas everywhere it make sense for users; especially when customers use and request implementations.
the new mouse scroll feature is a good addition, but it shouldnt completely replace the old slider.