clearly stated on many visa websites for many countries. Doesn't mean you must have one. There are many reasons you might not have one. I came without one again a few weeks ago by plane on a one way ticket with no visa but on a exemption. 🤷 People arriving at a land borders typically don't have one either. They use the same websites and same information you are quoting. If the airline needed one (immigration rarely ask for one in any country) I just buy a ticket. Any time I get a visa without I evidence my departure in other ways.
I forgot china. I flew into china twice and got a visa for both times. So I will correct myself on that one. Once I got the visa in UK and once in Hong Kong. Both in person
I've been to 100 counties approximately....some multiple times. Never flown into them. Never had a onward ticket and filled out the same website you have needing a ticket I never had. Never rejected once.
not strictly true as many people drive into Thailand and drive out. I've applied for many visas with no onward ticket. In fact all of them. I've never applied for a single visa with either an inward or out ticket.
and of course the Thai's made it really vague and difficult to negotiate. The basic issue is the definition of "remittance" and remiting funds here. Which if you use a credit card doesn't happen but again nobody has yet answered that one.
you're lucky military pensions are exempt from tax in Thai law. Other pensions are not. For the USA people they need the TIN on the forms. Most other countries have the equivalent of a TIN but its not that simple. Unfortunately this American lead nonsense isn't going away it seems.