It's fine and it's not fine. I was just ranting in the dino mega thread on this topic, because it's hard for us noobs to figure it all out. The cool thing about dry rock is that it's free of bad stuff. The bad thing about dry rock is that it's free of good stuff too

As soon as you steal something from another tank - you run the risk of introducing bad - aptasia, pests, etc. But if you don't - it takes a VERY long time for all the biodiversity to show up. It's a bit of danged if you do, danged if you don't.
Again - my tank is a year old - what the heck to do I know? Lots of people here with a lot more experience than me. But you absolutely can just throw your dry rock into the tank and wait it out. If you do that, I'd recommend adding some bacteria like you mentioned. Then I'd add some fish, and honestly, just let it be a FOWLR tank for a while. ya ya, you CAN add corals before fish - but you're asking for it if you end up with a big dino outbreak. If you have no corals, and you go get a massive dino or algae problem - you've got the easiest solution in the books, just turn off your lights

Can't do that if it's stuffed full of expensive corals. Then once you've gotten past all the bad stuff, and your dry rock has become "live" you can start adding corals and whatnot.
The problem is when you're new - you can't wait that long. And you do what we all do - throw things in there way too early, and the old timers start waving their canes at you shouting "slow down!" And they are right