We went through the whole dance a few months ago, and while most of the discussions were done by chat/mail, we still ended up snail mailing a ton of paper back and forth to close the deal.
Also most bank ATM still have closing hours, it can be way later than it was 10 or 20 years ago, but it still closes at night e.g. Mufg’s Kouenji branch: https://map.bk.mufg.jp/b/bk_mufg_s/info/BA592126/
Going further west and some will close at 18h or 20h without remorse.
For soundproofing, it’s less a matter of modernity than of price. Foreigners often will only get access the super low and middle-high offers, so there is a higher chance to land on a pretty well soundproofed building. Your random Leopalace built this year will still have paper thin walls, and so do cheaper appartments in general,