I used my reMarkable 2 tablet all throughout university (I only recently graduated). Searchability is an area that e-ink tablets can surely solve, although the reMarkable's software wasn't particularly helpful in this regard (perhaps it has improved now). You can only convert 1 page at a time using their OCR and they only recently added the ability to tag documents.

My favorite feature was actually simple: I don't have to erase everything to rearrange the layout of my notes. Being able to simply select a portion of the page, resize, and move it was killer. Another great feature is simply not having to lug separate notebooks around. The ability to organize and sort documents was very helpful.