@ Jojo Rabbit...As the trip got on after the first week or so, I saw more and more Americans, in Germany, especially in Munich and Berlin, the usual sites, and in Paris, obviously, and in small places too, ie, Fontainebleau, Troyes, Rouen (well worth going to, as I discovered after visiting the Tourist Office to learn of the exact location of the Napoleon statue (I had heard of this from other helpful French) which the Tourist Office girl heartily endorsed to see...bravo !
What is now different in Germany relative to pre-pandemic travel? No coin phones, likewise in France, no more call shops/internet cafes....only a minor obstacle, one can work around while traveling in Germany.
You still need a PIN to work certain DB ticket machines if that machine calls for the PIN, without which the transaction is cancelled. Other DB machines have the "tap" feature...just depends on which one you get.
You see "cash only" signs displayed on businesses in largely tourist areas, eg, Viktualienmarkt in Munich. As for small towns and card payment , I went to one such town, Ellingen/Bayern, had lunch at a nice sit down restaurant. I don't know if it was a cash only place, didn't ask, intended to use cash anyway, regardless.