I opened mine in 2016... On a TV. Had to have two ID : passport and Driving Licence. Bangkok Bank, Kao San Road Branch... The head of the office was reluctant first, but when I mentionne that my intention was to be retired in Thailand, he immediately signed... However, he mentioned that, to have access to PC online-banking, you need a work permit... :-/
Not if the borders are officially closed... Last time I took a flight to BKK (with Lufthansa) from Frankfurt, they definitely requested an "onward flight"... Otherwise, no boarding possible... Fortunately, I had one, so, no problem. Next time, I will do the same. ;-)
"Should" is not enough... Best is to call the airline and ask the requirement to board a flight to BKK... And comply with the requirements... Otherwise, huge stress possible... ;-)