As far as I'm concerned, the tone control is mandatory on F-type SC pups and bridge vintage 'buckers, and still useful on bridge hi-output 'buckers. I could live without it on neck 'buckers, but then I'd need a treble bleed (to replace the 50s wiring) to avoid the treble loss when using the volume pot, and I've never been happy with treble bleeds so far.
wrt/ "only substract" meme, well, I just fail see how it's a problem - I mean, unless you also states that the volume pot should be removed to because "it only substracts and this is conceptually the wrong point at which to do it" (not to mention the load on the pickup causing treble loss). The point is : neither electric guitar's electronic nor electric guitar's amps are hi-fi, nor are supposed to be. Most of the tones we love here come from imperfections, coloration, weird interactions, well, "inferior" technologies artifacts really.
Not to say a good buffer is something useless, nor that bad pots / caps / cables / etc are the way to good tone... But instead of "removing the tone control" (let's not talk about the pup switch) I'd rather add a switch to bypass the whole volume/tone part (if I was to go that way I mean).
My 2 cents...