So that means because I don't work for Autoglass, all the windscreens I fit, the cars will have rotted in 4 to 5 years? Stick to talking about something you actually know, rather than conjecture, lad....
Autoglass aren't the only company that uses primer and "bonding stuff", as you call it, and if you think that just because it's Autoglass' policy to not use kent knives, chisels etc, that means no one at AG uses them, then you're more foolish than you sound.
Likewise, if you're insinuating that anyone that does use a kent knife, chisel etc, is a barbarian and scratches every car, doesn't prime them, and lets them rot, again, you're a chump.
However, I do agree with you (to a point) about Nationals. I'd rather go work at MacDonalds than work for them. Shambles of a company, and although I won't tar all their fitters with the same brush, it has to be recognised that many, if not the majority of them, are the sort that I wouldn't let them touch my car.
With that said, you will find similar fitters working for the big players too; Autoglass, Auto Windscreens and The AA. Nowhere near as many, but there are always some in every firm. Thankfully, the QC with the better companies usually means these fitters don't go undetected, and eventually get found out and given their walking papers.
But there are some very, and I mean VERY, good fitters at The AA and Auto Windscreens too, many of which I know personally and would let work on my car any day of the week. Same can be said for AG.