@Stephen *******
that is not correct, a re-entry permit is entirely possible on the last entry to keep it active. But, with the extra hassle and cost involved, you probably don't want to go that way. Hence my advice.
My terminology doesn't confuse anyone; it's your inaccurate beliefs that confuse you. I've used the terms "multiple entry tourist visa" and "re-entry permit" entirely correctly throughout this whole saga.
Yes, I understand. I understood from the beginning. And even now, after all the explanation, YOU still don't.
I would not advise anyone entering visa exempt after competing nearly six months in Thailand on a multiple entry tourist visa. It may work but it may also not, and you probably don't want to risk the latter as it's an expensive joke. Better get the re-entry permit to keep the last entry active. And even better than that: don't get the METV at all but another, more suitable visa.