Because EI is a mod. B-Wing/E2, which allows a crew on a B, is also a mod. So you can't have both at once because a B-Wing only has a single mod slot. EI can trigger crew, but only on a ship that naturally has a crew slot.
It looks like you overlooked the crew that can be activated with EI. I don't think any of them are worth taking, especially with the 1pt. tax for crew that B-Wings have.
Leebo (2): Boost + Ion Token
Saboteur (2): 50% chance to flip a damage card face up on an enemy ship at range 1
Lando (3): Chance to get some combination of Focus tokens, Evade tokens or nothing
doesn't look like much as been overlooked, then
now, to be fair, lando's token(s) could be legit on Ibs' re-rolls (if you could muster enough trust in green dice to ever attempt the use of those slimy, double-crossing, no good swindlers...)
Whoops, you can't E.I because B/e is a mod not a title (I know, it gets me too). You can, however, PTL the **** out of a Lando trigger.
Why can't you use EI for crew cards? It just says equipped upgrade card with the Action header, doesn't a crew card qualify?
Right, I always think of E2 as a title, not a mod for some reason. Thanks for clearing that up.