LHC Dream party?

I don't see the point.

Me and 4 friends are raising a monster party starting after LHC. We're trying to get the "ultimate party" consisting of: Bucc, UA sair, paladin, bowmaster, shadower/mystery class, and an HS mule we can hopefully tele into LHC. We would have to stick to those alligators for a while but we'll move up to stone golems eventually. I think coming up with an ideal strategy for party combinations for a map is really important for fast exp gain and i've done that for my parties, though the whole thing is entirely theoretical obviously.

Making an optimal party for defeating some boss or pq (VPQ, DRPQ) makes sense. The profits can be used on/for your main.
But for training? The "profit" is exp, and that can't be transferred.
I want to level my Hero, so I'm going to LHC on Hero, even if everyone would prefer a Mech in their party. And my friend wants to level her I/L AM, so...
Making a whole party of alts who'll level really fast but do absolutely nothing for your mains, makes no sense to me.

I am in no way suggesting an optimal party be stuck to for training. Merely that the concept of a dream party should be taken more as a strategy that fleshes out the advantages of each class, rather than assembling classes to achieve dream DPS for the sake of optimal exp. Making a class shouldn't be based on ideal parties or how to be part of them. Making a class because you want to and forming strategies for it is how it should be.