Here in Germany, most traditional banks still have branches (assuming you are in a city). Not many, but still quite some (and it depends on the bank, some have more than others). FinTech banks like N26 never had any.
That's a good idea, one of the tough things about banks closing - espeacially in small towns where there isn't any around for miles, is the elderly struggle with technology.
My employer (in a ~40k town on the border of a metro region) rents out space to the local Sparkasse, who have 3 or 4 banking buses and a small non-public office there. I can see these buses come and go every day.
That said, last time I visited an actual bank branch was like 10 years ago to terminate my account with Sparkasse, have used an online-only one ever since.
It has an integrated ATM and 1-2 bank employees. Each half day it is at another village/small town.