The OCR is very good too and even my handwritten notes are indexed. I'm not sure if it indexes the text in images though. I used to use Evernote and it did an amazing job of that.
I used to use text files exclusively, then I moved to Microsoft Word so I could paste in images and other non-text items. I missed the handwriting part of it. Something about using those muscles and going slow helps me absorb the material better.
The rumor for next year's model is that it will get face id and that's something I definitely want.
The one big downside to note taking with an iPad is that it turns itself off frequently. Having to authenticate frequently with the home button is a pain and I think face id would be a lot less intrusive.
FWIW, I still scribble on paper, but that tends to be for very ephemeral things (like a number I need to remember for the next 5 minutes).
I'm gonna give Notes a try for a while and also Notability, because it appears I purchased it years ago.
For what it's worth, I don't think notability has OCR. GoodNotes appears to though. I might have to give it a try.
I don't know if it is my color deficiency or generally applicable, but the colored ink really pops on a black background. So if I have little annotations that I want to point out on a diagram, that helps.