The point is: if you live so long here already: then likely you travel rarely. So: you do not know how often immigration is asking. And: you have a long stay visa, so they do not ask you. So: you double do not know how often they are asking. So giving advices: they rarely ever ask, is not based on your circumstances. And: is simply completely objectively wrong.
"How often I fly is completely irrelevant to anything in this conversation."
I just explained: why it is not. You never saw one pulled out in front of you, because you do not fly often. Simple.
Well, rules are rules. Sometimes they make no sense. Thai law rarely changes: they just add new laws and new amendments. I assume originally there was no way to extend. And then they added the option to extend. The standard assumption is: if he really wants it, he will figure how to do it!
Doctor up a PDF is fraud. And that means a criminal offense. For example the embassy in Savannakhet has a big preamble that every fraud is criminal prosecuted.
So if a "doctored up" flies into your face, you are:
a) in Laos
b) under Thai jurisdiction
You can be lucky if they just deport you.
And you keep forgetting/ignoring: the problem is not the airline. It is the immigration officer.
Obviously: you don't know that it is not zero. How long are you living here, how often do you fly? What is the hardship if you get asked and do not have it?
You seriously get asked extremely rarely by immigration. But people her in this forums claim: "oh, they never ask!" Because they had three flights and did not get asked. Immigration can deny you entry for what ever they want. And they do not even need to tell you why.
That attitude is like approaching a traffic light with a little bit to high speed and just stopping just in time. And the police officer sitting there on the chair says in his mind: at least he stopped.
And is not asking for the driving license.
Have one of your blinking lights damaged in this situation, he would stand up and walk over, and tell you: your blinking light is damaged, get it repaired. Perhaps he still is not asking for the driving license, but perhaps he is.
Considering how simple it is to come to Thailand and how complicated it is for a Thai to get a Schengen visa for Europe, I most of the time shake heads. :D
The extension costs 1900 THB, a night in Laos 200THB 😛 (plus food of course). Just giving you the idea that you actually indeed could travel to a neighbour country.