I think it's a very cool idea.
They're only considered "weeds" because they're
a) cheap
b) very fast growing
c) super easy to keep (for the most part)
I'd rather do a little more pruning than sit there and wonder why my super-expensive LE SPS haven't grown and are turning white / RTN'ing /STN'ing etc. etc.
One of the members here was tearing down an absolutely gorgeous tank (I thought) because he couldn't get his SPS to grow (he had another one that worked) -- he had a super skimmer downstairs (amazing setup) with another column of phosphate remover, fancy sump -- the works.
He had another tank that wasn't as "clean" with a much smaller skimmer where the SPS was growing, so I figured his setup was just too good and the SPS couldn't eat. Everything else in the tank looked great -- brilliant red mushrooms, bright orange zoas covering large rocks, gorgeous fish, etc.
So not all of us want to be testing our parameters every day and spending hours tuning all the various reactors and removers only to go to Alaska for 10 days and have a dead tank or move our box of gorgeous jewels only to find them rapidly turning to white sticks.
Here's to easy, cheap, fast growing corals that look great!
Long live the weeds!