I entered BKK yesterday, it was insanely busy. Took almost an hour to reach the immigration desk.
I handed my British passport, printed A4 DTV and boarding card to the IO. I had the DTAC on my phone but knew they didn't need to see it directly from me.
She stamped me in for 6 months. No questions asked. I was not asked anything, literally. In fact I said literally nothing. Nothing about purpose of visit, how long I stay, evidence for onward ticket etc.
FWIW I first obtained the DTV November last year. This was only my second entry on it. For the first entry I stayed 93 days.
I also want to point, while I know it was silly not to, I did NOT do my 90 day reporting on that first entry.
The IOs all look so stressed by the insane lines I think they were just happy to process people as fast as possible that didn't need 'intervention'. I noted the Brits before me were stamped in on their exemption on arrival stamps in the fastest I've ever seen an IO deal with someone. Literally 45 seconds at the desk.