@Thaimer *****
I don't remember that being the case. At least for the past 6 years. Don't mistake the current situation and how much immigration agents check on the airport once you land, with the current rules and laws.
The same goes for the 20k baht cash. For a couple of years, they didn't actually requested this so often and suddenly when they started, people were like "that was never required" while it was in the rules for all those years.