Same reason I bought Marlin .444 Outfitter instead of .45-70 or .450 Guide Gun.
I already own revolvers and a carbine in .44 mag and have several .430-.431 bullet molds.
I have a couple of .45ACP bullet molds. Don't have any LC molds, even though I can use ACP bullets in LC barrels.
I have 3 pistols in ACP and 2 revolvers in LC and I don't have a clue which cylinder I want to get when I get my ROA. Probably ACP, because ammo is cheaper across the board than LC ammo. Plus I have a couple hundred rounds of empty brass for ACP.
I would think the LC would be more accurate in the ROA than the ACP, purely based upon the distance the bullet has to travel to get to the cylinder mouth.
My question is, how hot of a .45 LC load can the ROA handle? If it's as heavily built as it looks, like a Blackhawk, it should be able to handle loads as hot as a .454 Casull.