Philip, you're right, I do feel very strongly about this subject.
And keeping quiet about the exact location is fine. I'd like a quid for every time I've said that I caught a big bream from a Cheshire mere. The difference is though, the fish really did come from a Cheshire mere. I once exposed a lie on the British Record Fish List that was to do with a fish being claimed as coming from one county when even the Record Fish Committee knew full well it had come from a different county.
The point I've made is that it's enough for me to able to learn that a massive barbel has been caught from the river Dove. Or from the river Severn. Of course, with a big river like the Severn it would be nice to know if it was upper, middle or lower. But I don't expect to be told which swim or even which stretch. But I do expect to be told the truth, no matter how vague that truth is.
If the captor can't possibly even name which river or which county, then just say so - don't lie about it!
Yes, I state where my Personal Bests have come from. Perhaps you mean that those who have caught PB's from the Great Ouse's of this world don't state where they caught them.
I have no valid criticism about chasing known fish. That's something for the individual to decide, and if that's what he enjoys then good luck to him. I chase known fish on a well known French carp lake, but my only motive is that I so much enjoy fishing the place. What I do think is daft is chasing known fish in known swims and then trying to kid the angling world that you've done something special.
Where do you draw the line you ask. You draw it where your own ideals lie, and they're different for each one of us. And it doesn't mean that my ideal is any better than anyone elses, providing I don't kid myself or anyone else that I've done something special if I've chosen the easier option.
You say that they probably have a set of problems many of us can't even imagine. I would say you're right; where I've been battering my way through vegetation to find the Dove they've probably been battering each other to get to the best swim. Okay, I'm exaggerating slightly.
Decide what makes a fish hard to catch? That has a different answer every day. But few thinking anglers would deny that, for instance, a 13lb river Dove barbel is more meritorious than a 17lb Great Ouse barbel.
That's the point.