I didn't know I did it until I used a touchbar MBP, but it turns out a couple of my right hand fingers drift up to the tops of the number keys when making certain chording presses, which is close enough to barely brush the edge of the touchbar. Took me weeks to figure out what was up—I had no idea I was doing it. iTunes kept opening for no reason, or sometimes other things would happen (but usually it was iTunes). I'm not about to re-train my 25 years of touch typing muscle memory to fit a silly single-vendor feature that's probably not gonna survive in anything like its current form anyway—and besides, I can't make it part of my regular workflow if I use an external keyboard any significant amount of time—so instead I set it to always show the same set of stuff (no per-app changing) and then remove almost everything from it, using spacers to make about 2/3 of it permanently blank.

It's the only way to make a new MBP usable for me. I have to all but disable the damn touchbar.

I also have to disable force-touch on the trackpad to be able to execute all but the shortest of click-and-drag operations. Disabling two of the headliner "advanced" UI features of new MBPs are now very early initial setup steps for me. Machine's toss-it-out-the-window frustrating if I don't.