When-in-rome thing may now as well turn to when-in-tokyo thing. ;-) People in Rome don't do the masking these days, do they? Rather than caused by a sense of security on your health, masking is now for dodging peer pressure in MY case. Yes, the government still turns its wary eyes toward the spread of BA.5, so do many Japanese.
Now, let me give you a little example here: JR Tokai, (one of the Japan Railways), who have a golden thumb for their bullet train network (between Tokyo and Osaka), never fall to make on-board announcements/requests for their passengers in a very polite manner:
1)mask-wearing while on (and off) board (including/inside station complexes)
2)infrequent conversations (and that with reserve)
3)no rotation of (rotatable) seats (in case you want face-to-face talks)
The 3 things above stand to reason (to the ears of most if not all of the Japanese) when the voice says: all of these are for our valuable customers to use our services for the shinkansen ride with peace of mind.
Btw, most every announcement ever made, be it your flight, train, department/supermarket shopping, never ends without an apologetic (though cookie-cutter) remark, like: we are sorry for the inconvenience caused. Thank you for your patience/cooperation.
On a bit more less serious note, I guess this doesn't ask too much of overseas tourists: strangers should keep their distances when in public places, particularly if in congregated closed spaces. Yes, nigh on impossible when you're on a morning/evening commuter train. Yet, unlike in pre-covid days, people tend to not squeeze in in elevators when they're nearly full, the way I see them. Depends, as many sets (all in pairs) of neatly-arranged and paint-marked footprints as thought for proper spaces/capacities, are located on the floors of the elevator cabins. Talking of that paint-marked stuff, you'll come to know same goes with the check counters/cashiers at convenience stores, where masked customers stand on a set of marks each, waiting for their turn. Problem is, a tall line of shelves sometimes blocks your view and you make a beeline to directly approach there. not knowing you're trying to jump the queue. Such an embarrassing moment. But when that happens to me, I can hear me talking to mysef: it's not as if you dropped in at Inconvenience Store...