I got my first Thai licence in Nong Bau Lampu, May 2020 and did not need any translation of anything? I travel all over Thailand regularly on Non O retirement visa on my driver's licence when they ask for a passport I give them my Thai DL and have not been knock back, questioned only at hotels. My Thai wife simply says I needed my passport to get the DL so it is sufficient not even needed to hire a car, Thai DL and Aust Amex. I don't know why you are being so forceful with your comments?? Although I do carry my passport as does my wife on for emergency needs, accident, hospital or emwrgency travel outside of Thailand etc.
Thailand don't, some countries require a return flight 🛫 but not the airline, they will request because it's part of the entry requirements for them to take you to that country. Not Thailand even on a tourist visa it's not required. You may be booked on another airline so it's none of their business unless it's an entry requirement.
so have most foreigners living in Thailand, there not hard to get I just think some people a just don’t understand how to negotiate with “no have”. I don’t understand your first comment?