What do you have to book ‘ridgidly’ in advance. I’m in Thailand for two months. No plans at all and nothing to force me to do anything. I didn’t have accommodation booked, domestic travel - nothing! I just turned up. No forms to fill in - just turn up.
The rules are there and they may invoke them but usually they don’t. It tends to get tricky when people are trying to live in Thailand but using visa exemptions instead of getting the correct visa. At that point immigration may ask for proof of exit ticket.
Now all you do is turn up at immigration with your passport and get a 60 day visa exemption. What’s so hard about that? That don’t even ask where you will be staying!