Yes, it is a benefit to start with dry rock. You don't introduce a bunch of pests.
You can also take your time and sculpt a nice aquascape, rather than just stack the rocks as best you can because you are worried about things dying off.
The only real benefit to adding live rock is that you get good bacteria diversity. But it's not 10-15 years ago, there are so many bacteria you can buy now, that it just doesn't really give that same benefit.
But, some of that bacteria is bad. There are people who are getting live rock now, and then having coral die because it's carrying in a disease.
So that leaves you with live rock that has "other life" on it. Some of which may be nice hitchhikers, but most of which you could buy separately, or as I said above, is a pest. Best case scenario is you might get something like a rose coral which is otherwise impossible to get, and even that is not guaranteed or probably even likely.
If people want to go that route, more power to them. But to go in the opposite direction and say dry rock is bad is just straight up wrong.