I think it's a good idea for someone new to road bikes.

I would have liked one!-
In one year of riding, I went from a 9 stem (came on the bike), to a 5, then to a 7 where I feel comfy now. My body and my reach kept changing over that first year....and it's STILL changing!

Hey, you will likely be swapping various parts on your bike over time you own it.
So you can always get a black stem again after a year or two of using this adjustable one.
Bikes are frames....everything else is just swapping parts.