@Tod ********
The appointment system was being abused, hence why they reduced it down to 14 days from the previous 30 days.
The appointment thingy has never been an issue in Vietnam, but both in Laos (both consulates) and Yangon it's something that applicants and agents have been tinkering with, in some cases multiple slots were hoarded and then sold to folks. This has now largely been fixed, to the point that it's relatively straightforward to get an appointment now, at least in Laos.
You're right about Yangon also being swamped by local applicants, but I understand the primary reason for reducing the appointment forward bookings down to 14 days was due to the way the system was being abused. This is mentioned on the booking page of the Yangon embassy.