I just wanted to say I had a similar experience landing at Suvarnabhumi two days ago. The male IO shook his head as flipped through my passport showing all my previous years of METVs and visas from bordering countries. The grilling then commenced.
I was very surprised because I thought the visa exempt entry was trouble-free. Not true it seems. I think he looked at my past history of staying between 4-6 months every winter and thought that the 45-day visa exemption was the wrong approach for me. He asked me if I had cash on hand, I said I had 2000 CAD. He asked where I was staying and if I had "friends" here. No request for anyone's phone number though.
I'm not sure if he would have ultimately denied me entry, but when I mentioned that I tried to get a proper tourist visa, maybe that changed things. Thing is I tried to get a 60-day visa but couldn't get it and also lost the fee. ("No refunds") The E-Visa is a subject worthy of other threads of course. I wonder if this is a problem specific to the Thai embassy in Ottawa or with the E-visa system as a whole. Because I got no feedback from my email follow-up and phone message I left as my departure date approached.
Finally, on the same day I was leaving, I finally got an email from them saying I was missing two documents when actually I had already submitted one of them (bank statement pdf). Although they had a point about the other one -- hotel reservation for first 7 days, where I had only given my hotel for the first 3 days. And they screwed up my phone number that my file was associated with. Totally wrong number and wrong area code. So why would they wait until the very last day before telling me there was something wrong with my application? It's beggars belief. What is going on with this E-visa system? Sorry for the long digression.
Anyway, it was after I mentioned my failure to obtain an E-visa that his body language changed a bit. Maybe that worked in my favour. At least it would explain why I was trying to enter Thailand on a 45-day visa exemption.
So anyway folks, be careful out there. Just when you thought that the post-covid period would mean things would be easier, they may not be.