I do not do many calculations, so my only issues where when I tried it out.

If you open the calculator app and go to handwritten calculations (whatever they're called), you have all that cool stuff. But if you open Notes, you have to click "Insert result" every single time, for better or for worse.

Also about UX improvements: lmao. There is still no way to add a new line with Scribble, or sanely write in a small text box (I guess, it's only in third-party applications I have had this issue).