I've noticed this- even Manila is increasingly a location for this sort of maintenance work.
I think there should be a place where we as customers can easily see where carriers we may be considering are maintaining their planes and if they have appropriate regulation and oversight for that work.
But would they go for the cheapest if it was the most insecure and that information clearly presented when booking flights ? I believe they at least could and would balance the risks then.
Of course I agree we all have a different economic power (I, for one, have never set foot on a plane) but I have the feeling most of the HN crowd could discriminate between companies.
I think there should be a place where we as customers can easily see where carriers we may be considering are maintaining their planes and if they have appropriate regulation and oversight for that work.