Interesting guitar question. How many do you actually need?
The video doesn’t really answer the question realistically. You need one, yes. But there are other answers too.
I only need one, but I need to keep looking and trying different guitars until I find THE ONE. Specifically, the one that makes me not want any others.
x = n + 1 where x is the number you need and n is the number you have.
For me, I need two. Two of everything. I play bars in a cover band. I don’t have a tech sitting off stage who can fix things if my equipment should fail. I need to get to the set break. If a guitar (or amp, or cable, or mic, or pedal) should fail I need to swap it for something that’s working immediately. I can tinker with stuff all I want in between sets, but while the band is on stage I need to be up and playing right now.
In the video he talks about needing different types of instruments for different situations. This song needs a strat sound, that song needs a Les Paul. I am guilty of that all the time. In fact, when I think about trading in my strat I think about picking up another guitar with single coil pick ups. The strat is the only single coil guitar I own, so I should get another instrument that fills that role even though that logic is bullshit. No one is ever going to call me up for a gig that requires single coils. That’s absurd. If they want me, then they’ll be perfectly fine with double coils, all day long.
So maybe the answer is just that your needs aren’t as important as your wants. Who knows.