Agreed. That's why we need BV or Hughes back (not that either of them particularly lack for workrate, they just direct their energy into carries). However rucks are always going to be there, and always need clearing, a luxury player can help with that and improve that, if they are a big carrier like BV, it makes clearing the ruck easier, but we're not suggesting the introduction of a new big carrier.
Right now we have ruck workhorses at 2,4,5,6,7 assuming Robshaw and Haskell. Mako and now thankfully Sinckler provide carrying, and so should our 8, but our 2 main choices there are broken. Perhaps if we go for Simmonds at 8, we can have a less hard working 7, but we need to make up for the power carrying somewhere else.
Dirty work has to be done by someone. I'm also not suggesting Curry doesn't do it, but I haven't seen it but am often reassured he does, hence my repeated requests for a game to watch where he does.