Hmmmm. The only problem that really jumps out to me is the DIY guy, who isn't familiar with stranded wire, making up high resistance connections. I have already seen some photos on another forum of nitwits who have "reduced" the wire size of stranded wire to get it to fit into a connection by removing some of the strands.
I have scary visions of some mentaly deficiant H.O. splitting the strands or something stupid like that.
I work in industry and I must say that I greatly prefer stranded wire to solid. Mainly because it is more flexible. You try pulling 7 #12 solid wires though 2 90deg bends in a conduit.
I am sure that the NEC stipulates solid for a reason (I have no idea what that reason is.)
But, yes, I think that it would be easier to work with. And I do think that it would be a good idea if the person has the proper training, but we both know that won't happen.
"How hard can it be? Besides, my first cousin is an electrician".........BBBZZZZZTTT!