Well FWIW I have never changed the Regen level. I've learnt to drive on Max Regen.
I've read of people driving Bolts who think the lever (on steering wheel) that increases Regen is wonderful, and I've never driven any other Regen vehicle but Tesla, but I just can't get my head around it.
I lift off, regen starts, its more aggressive than I need and I'm slowing down too quickly, so I push the throttle a bit to feather it and I lose speed at exactly the rate I want to.
If some idiot jumps out in front of me I'm hard on the brakes (and have max Regen assisting too)
So, personally, I'm not sure why I would want to adjust it.
But your argument about "knobs/no knobs" is sound, and I am sat firmly on the fence.
When I learnt to drive, donkeys years ago, my Father insisted I could reach any control without taking my eyes off the road ... of course nowadays there is no car on the road with so few switches that that is possible (and where the heck is Voice Recognition, surely that would be the answer?)
So I'm not sure that menu-system is worse that knobs where you have to remember to pull/push before rotate left/right being different. You get used to all that easily enough ... but then you jump into Spouse's car where everything is different and you become a liability on the road all over again. Well, I'm saying "you", I actually mean "me" of course
The stuff I need is on the bottom row (always on screen) or on the first screen that comes up. The Lights (e.g. Fogs) are no longer there which is eyes-off-road to sort out, but there isn't really anything else that I have to dig for when driving.
The main APPs are two click - APPS button and then, e.g. Trip Graph. That is eyes off road, but for a very short time, and what I had before on Golf was a steering wheel button ... but then I had to watch the dash as I click-click-clicked to cycle through everything, so in practice that was long-interval-eyes-off-road
Infotainment is probably the worst eyes-off-road risk. If I actually want to fiddle with that I make sure that AP is on and, indeed, I have had a situation where cars in front slowed down significantly in the brief instance when I was doing something on the dash, and first I knew about it was AP slowing down.