Yeah as it is MFA issuing it not Immigration. MFA does not really seem to care :-) Thai Fiefdoms. I am assuming the MFA can see all the persons immigration record.
Yes this was another requirement implemented this year. Mobile banking requirements of SIM tied to ID (Passport) tied to account. Some long termers got caught out as used Thai wives ID to get SIM.
Remember December is the "High-high" season so you may want to book early in popular destinations. Places like the Gulf Islands were booked out last year. If this is a reconnaissance trip for where you want to move to next years I would be staying at least a week in places you are considering. If just a holiday enjoy yourself. On visits I have only ever used hotels and last 15 years or so booked through Agoda for personal visit.
Anonymous participant 934 Depends on the office the requirements. Bangkok did not issue them until a 90 day report completed but I believe they have relented on that now. Jomtien can get them on Visa Exempt/ Tourist Visa.