I suppose if everyone midscoops, it leaves a space for the vocals to sit.
Too often you get guitarists who don't scoop but boost the low mids & then all that can be heard, is them. I think it's important if there's 2 guitarists for them to have very different sounds or one set with very little in the way of mids & 'tother with little top end (both with very little in the way of bass), but it takes a bit of time to get guitarists to do this. My guitarists are now working quite well together.
Like is said above, it's about getting each instrument to fit & get the band sounding like a band & not a bunch of soloists.