-1 we already have enough battalions and there already lots of battalions with Engineer roles it does not need a battalion just for it's role and the whole RM comparison is accurate. But where is the greater incentive for people to really join that battalion over any other if it was added as ENG is a neesh thing at best so where would be the incentive for people to join the battalion who are not part of that neesh audience, even then from there those models are bad any why should server resources be poured into making new models for a yet unproven battalion really.
1. 38th Engineering Corps could:
Run Generator Room
Run Charlie
Run Artillery
Ships repairs
They are all things that and Engineer can currently do why add a entier battalion spot for it?