Same here, though I have not felt the need to leave *A due to TG or SWUs. I regularly take TG between BKK and HKG, and do many weekends (it can be a trick getting a multiple entry - or multiple - visas for Nepal within the same calendar year) to KTM using TG 319/320. No problems yet. I have not yet been overly inconvenienced by TG's routings intra-Thailand. I would imagine that you went to OW, you would still find yourself using *A quite often out of BKK due to the preponderance of *A ops.