I agree. but only way to sell this is with scare tactics and even that won't get a sale on maybe 60-70 percent of people. If it is still working they just not interested in paying you to mess with it, I don't blame them either I probably would be same way if I new nothing about this kind of thing though.Most burnt receptacles I've seen have been overheated from the front. Most seem to have been caused by damage. Probably people yanking or tripping on cords
I've occasionally seen a backstabbed receptacle with severe heat damage to the conductors. Just this past week I went troubleshooting and almost knew what I'd be looking for before I showed up. Loose backstabbed neutrals. It does happen, for sure. But I think you're probably right overall.
Honestly, I think we have a bigger responsibility, which is to inform the public of the importance of maintenance. Whether it's screw terminals, backstabs, cord damage, or whatever, I'm not gonna bash any receptacle that's held up for 30 years or more. It's past time to start thinking about mass replacement of devices.
I probably don't do a lot of things doctors recommend either, kind of no different.