I have to agree with a couple of points...
#1 It is BEST to do the work to pick the right pup out of the gate
#2 This place IS obsessed with magnets. I'll say it: There are a number of us out here who are almost magtarded. It is as if every magnet MUST be swapped. Simply not true. It's like the boo-teek pedal geeks. If it isn'ty new, custom, modded and expensive, it must not work.
That said, if your warranty is more important than the tone....well, there ya go.
I agree that EVERYONE should do THIS:
#1 Pay attention to the tone of the guitar and the amp. Learn the guitars inherent sound and how to play the amp.
#2 Learn to REALLY adjust a pup. Then, live with it for a while until you are sure of what it can do - or not do.
#3 Then, try to get the RIGHT pup first. Discuss, listen, consider....
#4 If that didn't happen, then getcha some mags!
(3 and 4 may be changed as appropriate)
At the end of the day though, this place is about doing what is necessary for the tone.