Yes, it is a disappointing state of affairs. It is certainly an adaption, I'm using OneNote on my iMac and it took a couple of weeks befriending YouTube again to get up to speed.
I've used a simple import tool by Microsoft ( https://www.onenote.com/import-evernote-to-onenote) with minor issues - mostly password protected notes did not transfer.
Honestly, I still hold out that this will be solved at some point. The problem is that I am now getting sucked into the MS ecosystem which evolved quite nicely to support how I work.