This deserves a +1...
Technically speaking, if one does sufficient WC daily (with exact replacement of ca/kh/Mg, I think there's no need for skimmer, CR, dosing whateva...
Jut chaeto and other macro algae could suffice.
How many of us can do that daily??? I know I can't, thus have to rely on equipment to "automate" for me.
If I could, my next setup, I'll definitely ensure WC is as effortless as possible.