For me, it's simple. I HATE the fender Strat. Now, before the pitch forks and torches come into your hands, allow me to explain. While I personally hate the strat, there are some great ones out there, and some great players of them. But for me, it was designed flawed.
Ok, 3 pickups, good... 3 knobs... Oh, ok, interesting... 1 master volume, Good. 2 tone.... ok... tone for the neck, good. tone for the middle... really? Why? is there a strat player out there, who actually uses the middle pickup by itself? AND the tone for it? Then, uhh, wait, no tone for the bridge? Why not? Do people want their bridge pickup to sound bright and peircing, with no way to adjust it?
The three way switch. It took Fender over 20 years to realize that there may be a few people out there, who want to use more than one pickup at a time. But what about the neck and bridge combo? Surely that deserves to be heard?
Then there's the bridge. Play a chord. Use the trem, play the same chord again. No, not quite the same chord, is it? I know there have been upgrades, and it isn't as bad as it was, (unless you have a floyd, but then you don't have a strat anymore do you? You have a strat with a floyd.) but the entire concept was flawed from the get go.
There, I feel better now....