I don’t disagree with anything said here. The issue with commercials tends to be that simple changes can often spiral timescales a little out of control depending on how heavily color is booked. The reliance on approving in color with final color also often means that clients will leave what would otherwise be simple approvals out of the hands of vfx and in the hands of the colorist in their bay.
…and there are some colorist here in LA that like to throw that power around a bit. In-house is one thing and can be managed but once it’s multihouse all betts are off 
Conceptually I like ideas like blgs and Baselight Editions—if the errors were fewer and the performance was better.