@Steve *********
I think there are two main types of cases. One, which I was, here on visa exemption or short term visas. Most banks (all in my case, till I went with agent) seem to say "no". The catch is for retirement visa need 800k in Thai Bank account...And to have Thai Bank account need retirement/long term visa. It would be helpful to many people if we identify bank branches that open for this category.
If you r here on long term visa, it seems to be easier. The answers often seem to confuse these different categories.