Live rock is for those who cannot wait, but wish to spend forever to remove pests, some which only come out at night and munch on expensive things.
We’ve been setting up systems for 30 years with both dry rock and marine pure, pre-seeded with bacteria, but with no chance of Aptasia, crabs, bobits and any other funky pests that come with LR.
Sure, it takes a good 6 months of keeping those parameters right on point, but afterwards, we have nothing in the system that we did not put there.
Ever try catching a gorilla crab in a full tank, good luck.