[oldE]

Absolutely. When I had to rough in the drains, everything was on site. I just had to dig some shallow trenches, put the proper pieces in their places, build a couple of enclosures around the inlets and cover everything else over again before the concrete guy got there the next morning.
Every time I use the showers, I mentally thank my plumber for his work on the rough plumbing on the feeds. Regardless of whether someone runs water in the kitchen, flushes a toilet or the washing machine starts, there is no change in temperature or pressure at the shower head.
He earned his money on that.