Baltic, I know what you are saying, but i cannot agree with you
Yes a 7, even a 6 weight will subdue a pike, but, and its a big but, the pressure on UK Pike is high and its generally accepted that it is better to play a Pike hard and release it quickly rather than use "sporting" gear and take longer to land it, especially in the summer.
When I was asked to develop a fly rod for the Pike Fly Fishing Association I did a lot of research (I have a backgrond of 30 years of Pike fishing and 25 of fly fishing) both here in the UK and in the US, Canada, Holland and Scandinavia.
The rod i came up with is a 9/10 weight with a medium fast action. Big flies do not work on super fast action rods, simple as that

You need a slower, more open loop to turn the fly (talking of 8-10 inch flies). It needed to be strong enough in the butt to handle large Pike from boats and to have the power low down to throw the large flies.
Pike fly fishing in the UK is all about conservation. Telling folk they can PFF with a 7 weight goes against all the PFFA strive to promote. Now, you and I both know that a 7 weight SWFF is a vastly different rod from a 7 weight trout rod, but the average Pike angler does not know that, and the PFFA has had some very hash comments made by the Pike Anglers Club of GB and some very high profile Pike anglers. Some Trout anglers have also tried to fish for Pike on some of the big reservoirs using trout gear and several large fish have ended up dead.
So, although i have fished 7 weights myself, and 8 weights on smaller waters, I do think a purpose designed Pike rod of 9 or 10 weight is the way to go in the UK.
I hope you see where i am comming from and i totally understand what you are saying and behind closed doors would agree with you...but as a member of an association having an uphill battle, heavier gear is the way to go