sorry you are correct, however the DTV is from foreign affairs not immigration... The point I was trying to make ( and incorrectly ) was that it is not issued by immigration but the IO had control over it at entry immigration.
The biggest problem is that it's not a visa from immigration but from BOI. There is still an open question if you have to maintain qualifications to extend our re-enter. Some IO have given people a hard time, some people have no problem.
You are supposed to be able to get a Thai DL with a DTV, but some DLT won't do it.
So as with most things in Thailand your mileage may vary.
I would also say that bank account is a really big deal. Free access to ATM and QR to pay is a huge deal of you really spend time here. Also for payment of utilities and rent .
If you qualify, it is a super easy visa to get and it's cheap.