I too am British (not proud of it) and have had many visa exemption stamps on arrival. I was told by Trang immigration that the best way for me to make my retirement visa was to convert it from a tourist visa when within Thsiland. There are also many other reasons why prople may opt for a tourist visa rather than a visa exemption stamp. But I won't spoil your fun by explaining it all to you when you can busy yourself by conducting your own fact finding. Originally I was applying for a retirement visa but because Bangkok Bank will not issue a statement to anyone who is outside Thailand who has not previously added their account with the 800,000 baht in to the bank's app I am returning on a tourist visa. The advice being that they can be reluctant to repeatedly give exemption stamps too many times in a 12 month period. Common knowledge apparently.
where I am and what I am doing is not really the issue and it is not important for you to know all the details which can change as plans change. What does not change is the requirement in multiple visa application processes for an invitation letter if you plan to stay with family or friends. However what if they do not fit into the box that immigration like to think everyone exists in?
well obviously I can be bothered. That is why I completed the evisa application. What I am also free to do is report and reflect on the realities and mock people who melt when I do that.
the rules and guidance are vague and interpreted differently by different ports, embassy, immigration departments, police,and agents are there because of the deliberate confusion designed to create money spinning enterprises some are convinced are necessary and value for money. No wonder many foreigners are viewed as having more money than sense, falling for it so many times.
believe me, it came as a surprise when it happened. But happen it did, hence a claim for compensation will be filed. The check-in clerk was a know nothing jobsworth.
the difference here, if you failed to spot it, is they are only asking if you will leave before 90 days. Not asking for a complete itinerary even if you only give a fictional story. The main point is, why ask for itinerary details and then look like you are just time wasting and trying to overcomplicate matters and not actually have any infrastructure or policies and procedures to require anyone to do what they put on the form. Just another case of state brutality and a hostile environment for the sake of making a few baht. Not a proven method for earning respect...