Do you really think that adjusting after each and every shift, instead of setting-up properly just once, is simpler?

I want a lower gear, I pull a trigger or tap the shifter, and I'm there. One step, finished.

When I was on my friction shifter, I moved the lever to shift, I adjusted the shift. Two steps, finished.

If I didn't have to adjust the shift after moving to a higher or lower gear in the back, I almost certainly had to adjust the front changer to allow for chain bend as the rear sprockets are traversed.