Interesting stuff. I can't remember if the older relays were rebuildable like these, but I do remember replacing some relay on a w108, 25yrs back. Certainly not the sophistication of one of these little guys.
I can understand that they could never sell the cars for what they'd need to with yesteryears quality, but little things like this, or the way the doors no longer have the safe like feel - weight I suppose - but I note they just have a cheap look. Whatever, it's a great car. Just not the light years ahead of everything else they were in the 60's.
Oh and "Manny", I've owned 5 Mercs over the last 35 yrs and none were made in the US or Canada