@Henri *****
Most of tourists come on visa exempt entries for 15-20 days or less, or at least on VoA. Minor fraction of all tourists come for a longer period, many of them still on visa exempt entries, only part of them would require upfront , and even smaller numbers are getting all the rest of kinds of visas.
Hence, these all issues about visas at embassy and consulates have no relation at all to immigration experiences of absolutely vast majority of tourists.