My questions were indeed very basic and yet you did your best to dodge them. Low valuation is advantageous when the inherent reasons leading to it change at some point during your investment horizon. If they don't, the valuation isn't "low", it's "justified", and from an investment perspective - useless. Justified by who's opinion? by the market's opinion, and that's all that matters. Now if you could demonstrate higher dividend yields for example, showing the valuations are indeed objectively low, then you might have a leg to stand on. No numbers were shown to support your claim.
So, low valuations - not substantiated. Next.
Then, instead of any supporting facts, we got a writeup showing an admiration to the US financial sector. Anyone with any idea at all about the nature of this business knows the function of most financial analysts isn't to discover any hidden value but to generate as much business as possible to whatever financial institution they're working in - namely - commissions and management fees of all stripes and colors. I hate it break it to you but the income of investment banks and most other financial institutions doesn't come from superior returns but from client fees, a decades long fact summarized by the famous question "where are the clients' yachts??" (google it). Indeed if you put your trust in Bank of America's or JPM's buy and sell recommendations you are better off buying the Nasdaq or whatever equally random action you wish to take. And if you are not aware mutual funds rarely ever beat the market after fees then I suggest you do go back and do some serious research.
Now let's talk buy-side analysts, hedge funds, and others that are indeed in the business to find value. One could claim they are not active in the Thai market and leaves a lot on the table. Sounds nice, but as my first reply here showed you, in actual numbers, that foreign investors are a very significant part of the Thai market. And we are not talking Joe from Ohio or Jane from Mississippi. Those are foreign financial institutions, American, European, Asian and what not that move about 50% of the monthly market turnover. Yes, they are here. It may come a s surprise to you, but they are indeed very much aware the Thai market exist, and the point of looking for value in such emerging markets isn't lost on them. No, you are not the first to think of it, I am truly sorry to disappoint you. JPM, CS, UBS, and more have taken the pain to become actual registered members of SET due to their large activity, and many others are active without being members, using foreign and local staff to analyze local equities, with infrastructure and resources you do not posses.
So, low competition - not substantiated. And even if you have a point here, you as a foreigner have an inherent disadvantage due to language barriers (the issue the OP seems to rightly struggles with) but more importantly since you'd be the last to know what goes on, after all the insiders have acted. With any apparent advantage due to lower competition you'd still need to fight a uphill battle with the disadvantages of a less transparent market that has poor coverage, almost of all of in Thai (if you still don't see how this is important, I suggest you go back to the beginning and read again).
Bottom line - as I mentioned, we deal with facts and numbers here. Not fiction. You haven't shown any, and I doubt you can. I guess it's due to your limited time to engage ????