Leftos has confirmed that the team building logic no longer works by OVR alone and actually understands fit and roster construction, so if properly designed, offense only teams shouldn't be a thing unless it was trying to replicate actual offense only teams which would be pretty cool.
That said, skewed OVR will cause some decisions to lean the wrong way, and the standard 77 for 3 and D guys and 81-85s for no defense low efficiency chuckers is a big problem.