In reply to Pekkie:
Hi Pete, many thanks indeed. You're absolutely right; as with the pitons which they superseded, the first hexes and stoppers were beautifully done. Though I guess Brits of a certain age will always have a fondness for MOACs.
In the first essay I mentioned Doug Scott's great book, 'Big Wall Climbing'. There were two photos in it which really were the shape of things to come. One was of a cam in an inverted crack. I think it was by Greg Lowe. I remember thinking, 'It's only a question of time until virtually any crack can be protected.'
The other photo was of a gritstone climber with what Scott felt was a way too big rack. Clearly he was a man ahead of his time! A modern rack is probably about three times the size of a '70s rack and five to ten times the size of a '60s rack.
The result? Take a route like Right Unconquerable. When Joe Brown first did it in 1949, with no gear, he was facing a death fall from the top mantle. I used to do it with three pieces (two in the same place, none cams). Massively different situation to Brown.
Now, armed with a big rack of cams, anybody knows that if they get pumped or gripped, all they have to do is hang on for a few seconds, get a cam in and slump on it. Massively different situation again.
Obviously 'plug and play' means more traffic on the route and ever greater chances of the flake being damaged by hasty/poorly thought out placements.
Thankfully there's much less chance of someone getting hurt. But equally there's a moral question, "Should I be on this route at all?"
Mick