So, you DO need it!
It is subjective. For me it is sonic variety, and the path to finding MY tone, and what feels right in my hands (and my back).
Of course, I'll have to learn to actually play the darned things, which is my main focus. I'm somewhere in the 'intermediate player' category I suppose, at about 7 1/2 years in. I'm not a natural; even the "easy" things have been hard for me, but I enjoy it.
I usually play the same one for several days or a few weeks before the mood strikes to shift gears. I also think switching more often detracts from my focus. When I do switch, it is somewhat of a new guitar day! If I dont get that "Man, I really like this guitar!" thought or feeling, it may be time to sell.
I have a typical style tele and SSS strat, 1 P90 LP jr, the other LPs, an SG with 2 HB (some A2 or A5 magnet PAFs, some more modern PAFish), a shreddy higher output bridge HB HSS w/Floyd, the new Vee, a semi hollow with a Gretsch Filtertron bridge pickup, 1 acoustic, and the Firefly Jazzmaster style incoming I have yet to explain to the wife.
And a beater bass. I love playing bass!
Still a beginner there, but am digging it.
Plenty others have come and gone.
Some of these may go as well, if I've "lost that lovin' feeeeeling".