But OP has a point regarding taking a hit on the market of offhands. You can just go to BT normal and have one modifiable for the entire campaing., No point buying an offhand again.
Understood, but the same has been true for quite some time now for armormechs/synthweavers.
Artificers get to sell crystals and enhancements (and hilts), armstech gets to sell augments (and barrels) and armormech/synthweaving gets to sell augments.
Seems sort of balanced, to me..... though largely in a sucks for everybody sort of balance.