I did recently discover you can turn off “Web and App Activity” for your Google account, which seems to disable Google saving most of your data (searches, viewed places, etc), for what that’s worth. It definitely cripples Google maps even more than I think it should, since now I can’t even search for labels I’ve added to Google maps myself.
I’ve been meaning to try Organic Maps as well, but haven’t even gotten around to installing it yet.
I’m just guessing, but I assume that after a certain point, what you’re trying to draw is so niche and/or new that no one’s bothered to make decent software for it. Like, you can do a Feynman diagram quickly on a chalk board, or spend 3x as long dragging lines in Visio or something to make a diagram diagram.
Even with CAD existing, I still always sketch initial project ideas out on paper just cause it’s fast and easy.