I used to hang out in the back of one of those repair shops, so I remember what they were repairing. There were through-hole components and chips with pin mounts, most armatures were pot metal.
If you looked inside a TV now, you'd see mostly surface mount components, and molded plastic armatures.
There's just not as much to repair anymore, things either work or they don't. I'm not saying it's good or bad, I'm saying there was no conspiracy to drive repair shops out of business, just a general switch to more reliable (yes, more reliable) electronics, which happen to also be less repairable.
White goods are a different story, things like washing machines have been built in an increasingly cynical fashion.