I was only asked once if I had a visa, when no return ticket and checking several big bags ("It looks like you're moving...."), I showed my DTV and they accepted.
I shipped a 20ft container from Singapore, so it's definitely possible. There is duty; though I don't know how much, it was apparently reasonable. Think mine was estimated around US2500 - I had furniture, electronics, sporting goods...
I put UK, not HMPO, for Place of Issue, in HCMC and 2 times in Jakarta, and was approved for all 3. In fact, not all countries have "Place of Issue", mine has "Authority".
Anonymous participant I applied in HCM as a Brit working for a Singapore country, so definitely does not need to be your "own" country. Further, it says "their" country, not "their own". Subtle difference.
I understand what you say about common sense, but since this is targeted at digital nomads, I imagine the perceived concept is that most would understand that a fully online application might rely heavily on computer verification, as with most things online. I would imagine that the Thai government would rather rely on the applicants common sense, then spend money implementing OCR systems that cater for every permutation of every language.