This is one reason, the other is just fraud. Being from a developing country, I am well aware of the stigma of saying I don't know, which I had to strip out of me as I became an engineer to the point of me being immediately suspicious when someone tells me they know about some moldy complex topic, even if it's in their profession.
The fraud part is that I developing countries, almost all activities that require some skill have lots of people claiming to be experts. 99% of them are lying. You take your car to a shop and they tell you they will solve your problem. With skepticism, (because they asked no clarifying questions) you try to give them some context and they tell you not to worry.
1 day later they tell you parts X, Y and Z need to be replaced, it will just cost $$$. You ask if there is no way the current parts can just be repaired, and they tell you no, they must be replaced.
You ask what was the actual issue, and they tell you the parts are completely damaged, or worn out, need to replace.
Sure, you pay, and they give you the car, works for a few days, maybe week, then breaks down. You plug in a portable OBD scanner and it tells you the exact component they just put in is failing (likely not even compatible with the car).
You give them back the car, tell them since you paid $$$, you will only take the car back once it works perfectly, and you won't pay a cent more.
They then spend the next few days looking for an actual expert, that comes in and repairs the original parts, for $, and they take the "new" ones back to the store and give you your money back.
They don't know anything about cars, they experiment on yours, with your money, by swapping parts. This was easier when cars were less strict with parts.
This is fraud, not face saving, and it's in every developing country.