And P90's can handle very heavy sounds.
I guess I'm not a shredder so maybe that's why I think investing in a 7/8 string is pointless.
I'll take the baritone or a 6 string in open g/d anyday to a 7/8 string.
Frankly I'd rather have a different sound in my collection too hence why I suggested the tele since it offers a new style of pickup as well as being semi hollow providing a chunkier/airier sound and different tonality.
Something that hasn't really been mentioned either is how uncomfortable most 7 and 8 string guitars are to play.