Ah yes, the famous "costdown" measure...
In fact, this is something both Taiwanes and Chinese companies are great at, to the point where you might get an entirely different product than what you wanted... Also, a lot of this sh*t ends up breaking certifications and what not, as changes are made and certifications aren't updated, due to the cost of doing so. This in turn makes this actually illegal, but it's not as if it isn't done by most companies...
The thing that most of you seem to miss here is that many brands, as that's what the likes of Belkin, Netgear, D-Link and many others really are, can use different suppliers for the same product. This is why the same product can vary a lot in terms of quality as well. D-Link doesn't even make their own hardware designs, or software in many cases for that matter, they just tell their partners what they want, the minimum spec and give them some UI guidelines. I've been to some of the factories that make D-Link products and there's not a single D-Link employee there.
Foxconn, Quanta, Clevo, Mitac, Pegatron, Wistron etc. all make pretty good quality, otherwise they'd be out of a business, as no-one would want to work with them. However, companies that don't have their on QA/QC staff in the factories often end up with sub-par quality, as one thing in common with most of the manufacturers is that if they see a way to save a penny and they think you won't notice, they'll most likely do it. The reason for this is simply that there has been and still is to a degree, a race to the bottom, so when you have 1% margin or maybe less, you're going to do whatever you can to save on cost. Unfortunately this often means that there will be issues down the road.
So if anyone wants to complain about the fact that the quality today isn't what it used to be, look in the mirror and consider what you're willing to pay for something. If you expect a $30 router to last a lifetime, think again.