I'm not qualified to comment on the medical aspects of this decision. It's fairly clear that people will find what they want to find to bolster their opinion. I saw a comment stating that WHO had no problem with health authorities mixing vaccines. I believe Angela Merkel mixed vaccines. Is it just possible that Thailand is looking at mass vaccination in a bid to open up the country? Reduced cases look encouraging. No doubt that will be, in spite of, and not because of, the Thais.
After many years here, I feel fairly qualified in identifying Thai bashing, and I'm glad I'm not, and never will be, part of it. Constructive criticism is fine, and I'm not saying there isn't any here, but it comes at a price. We all know the saying about a glass being half full or half empty. Some here either state the glass is empty or the glass isn't even there in the first place.