Proof of onward ticket is most definitely required, although not always requested. My own experience is it happens more often since covid. Qatar Airlines and Philippine Airlines have asked several times
You won't get a straight answer because there isn't one. It's more to do with patterns. If your history looks like a typical tourist you won't have a problem. If you have a pattern of being in Thailand for two months, leave for a day and come back again for another two months it raises flags. And as
Motorcycle taxi drivers are licenced as such and must display their ID. If they have this ID they will be correctly licenced. Just make sure the picture on their ID matches their face 😆
And an METV does not require £17,000 to be put into a Thai bank account, does not require a bank account to be opened (which can cost 5000 baht through an agent - which is roughly the cost of the visa), does not require 90-day reporting, and can be pushed out to nine months