@Jason *****
, surely you know that the reason why Thailand - or, frankly, any other country - refuses to publicly draw an explicit line regarding exactly how many times that (supposed) ‘tourists’ are allowed to reenter the country back-to-back using tourist visas is because Thailand knows fully well that such ‘tourists’ would then take full advantage of whatever line is drawn.
For example, if Thailand were to publicly declare that all tourists are indeed guaranteed 2 back-to-back extensions and are therefore allowed to stay for a total of 9 months as per your request, then that would surely attract plenty of supposed ‘tourists’ who, frankly, have no interest in tourism whatsoever but rather are just seeking a 9 month residency in Thailand. And if Thailand decided that they indeed want such 9-month residents, then I have to believe that Thailand would then simply offer an upfront 9-month visa that dispenses entirely with the need for a visa run. Clearly, Thailand does not want such 9-month residents.
And that’s Thailand’s prerogative. We all have to remember that Thailand is a sovereign country that can run its immigration policy however it pleases. No foreigner has the ‘right’ to even enter Thailand at all - let alone stay for 9 months - just like Thai citizens don’t have the ‘right’ to enter our countries. After all, ultimately, it’s their country, not ours.