So a lot of people have pointed out how the Hardcell is very fragile if an opponent can get a side arc shot on it, but I was just looking at auxiliary shields team and I wonder if that card is the answer. It allows you to recover one more shield in your right and left hull zones. What do you guys think?

Its pretty common on the Nebulon for that exact reason, but then the Nebulon doesn't have a Redirect (barring Vanguard).

If youre not using FCTs or ProjExperts, and have literally nowhere else to spend the 3 points, then its worth taking, though I'd keep it cheap and screen it with a Munificent.