Also, "no modes" is both a question of personal preference and a sliding scale. Input-has-focus is a mode, too, but getting rid of that would be an obvious mistake.
I hardly ever touch the mouse, but if I am using it then I'm most likely copying and pasting. Don't make that difficult.
When I'm reading a long article, my usual strategy is to middle-click and then move the mouse to a position that causes the page to move in time with my reading speed. The continuous movement is a lot easier for my eyes to track than occasional bursts of scrolling, and I can tweak the scroll speed by subtly adjusting the mouse position. It's a bit like cruise control for scrolling.
I'm not saying you ought to use it, but you're decrying it as "not user-friendly" and "not needed" when what you really mean is "I don't like it" and "I don't use it".
Windows now has clipboard history by pasting with Win+V, having the best of both worlds.
I'm sorry you can't adapt, but honesty no one cares =)
All trackpads I've tried support middle click via a three-finger tap.
https://superuser.com/questions/90257/what-is-the-difference...
https://www.gnu.org/software/emacs/manual/html_node/emacs/Se...
https://www.notebookcheck.net/Review-HP-ZBook-15-Workstation...
I disabled tap to click and all gestures except two finger scrolling.