All of the old timers tried everything that was coming out including all the pedals and overdrives, and THAT was the classic sound you hear on particular recordings.
Andy Summers is not Clapton or SRV or even Leslie West (haven't seen HIS name on here yet. Saw him live....awesome!) Andy Summers is not Robin Trower he's not Dicky Betts, and he's not James Burton.
Day to day....if you take one of the new modeling amps and set it up next to the original tube amp you might hear a 5 % difference in tone, but you will get the same tone you want at a volume that isn't 90% of the db of a 44 magnum. I love the tube sound but to get the grit and the compression you have to turn them up.
I agree with a lot of what you are saying, Jay. I have nothing against using different pedals to achieve different sounds, a la Hendrix (guy tried darn near everything from what I've heard and read). Honestly, I have nothing against modeling amps either, although I'll never buy one, I just wanted to bust your chops a bit. I do, however, remain steadfast in my belief that
no modeling amp can compare tonally to an over driven all tube setup, whether the overdrive is achieved by "cranking it up" or through the assistance of a box like the old Tube Screamer like SRV used, for instance. Their is no real comparison in my opinion as the "modelers" are devoid of the warmth and subtle nuances of the real thing. It's like a photocopy of a Rembrandt, its pretty and the colors are right, but you can't feel the brushstrokes. By the way, have you tried using a Marshall Power Brake or anything similar. I thought about getting one due to the volume issue you eluded to, but haven't been able to try one out yet. As for Andy Summers, no he's not Clapton, SRV, or Dickey, but his point is valid. You should know, look at most of the great blues men. B.B. King, for example. I don't believe you can say he is a rhythm guitarist, nor could you argue anything about his tone sans pedals and effects. On the other end of the spectrum is Pete Townsend, LOTS of effects and a rhythm player if their ever was one. No hard feelings, man. Just my opinion, which usually means it's not worth much.

Swoop