i would say so, if you going to have another setter i would set something else like toxic spikes or sticky web
cause more often then not setting one layer of stealth rocks isnt hard and once you set stealth rocks another setter is useless
cause you cant go two layers of rocks but you can go layer something else on top of the stealth rocks
as well as the fact that defog/spinners, i dont want to say are uncommon cause players use them but more often then not players wont run them