Of course it doesn't guarantee one entry. I suggest there is no such right into any foreign county. But I found it very detailed,and glad I did it beforehand. After a 20 hours journey from London via KL, I wasn't in the best of form to complete at the airport.
Wrong! I completed the TDAC before arrival,and it was checked thoroughly by the Immigration Officer. I presented my mobile with the completed document within. She scrolled down until the end of such. Then stamped my passport advising me not to overstay. Of which I have no intention of doing so! I'm on a visa exemption stamp until the 4th August, then will most likely apply for another 30 days at Jomtien Immigration.
It will inconvenience many on both sides of the border,benefiting absolutely no one! Resulting in a loss of income for both countries which both can not afford! I suggest the nationalistic zealots on both sides should wake up,and realize that we're in the 2000s,well into them, and not in medieval times anymore! Grow up for f--ks sake!
My recent history entering Thailand: All on visa exemption. 13 days in February, 14 days in April, 2024; from June 2024 until February 2025, 30 days in June,obtained upon arrival. 60 days in July,60 days late August,60 days late October,and 60 days days late December. I never had any issues/ problems at all! I hold a full British passport.
Hence I would respectfully suggest,that nationality counts,as does appearance, demeanour, age, and politeness.