Apparently in Laos they're using a hybrid system where you everyone is interviewed meaning just staying in Laos isn't enough - you actually need to be in Vientiane (or Savannakhet) so they can see you in person.
The hybrid part is that you apply online, pay in person and will be interviewed as well but then you receive your visa via email.
NO. Better to get a DTV or another visa type you qualify for. A tourist visa or exemption should ideally only be used for multiple short stays well under the limit or for one stay up to the limit plus extension
Presumably, an applicant would wait until they're asked for more documentation before leaving the country, so what you say isn't usually a concern. Only a small handful of consulates perform interviews.