Navy's problem is not lack of security control center. I swear its the same thing people said about Scum pre-BTS. Scum needed everything, resources, force holders, better events, better mains, better chuds, more shields, more elite, yadda yadda yadda. Now that Navy is bottom of the totem pole it's the same thing.
Let's look at DS shields
Navy has 7 sources spread out over 5 sets.
-Endor Gambit Officer
-Endor Gambit Enhancement
-Death Squadron Star Destroyers x2 (in one set)
-AT-AT's x2 (in one set)
-Big AT-AT x1 (in one set)
-Blizzard AT-ST x2 (in one set)
Sith has 3 sources spread out over 3 sets
-Coruscant Defense Fleet
And Scum with 3 sources spread over 3 sets
-Black Sun Headhunter in 2 objective sets
-Protection fate card in the mostly useless Shadows or Nar Shaddaa
Neutrals have two options both of these combo with Navy better than any other faction
-Sabotage in the Snow (a great inclusion for a shields and counter shields meta)
-Asteroid Pursuit (not optimally designed set but tons of synergy for shields and cheap ones!)
I see no way we can argue that Navy needs even more shields. If anything this proves that having tons of shields and easy ways to get them into play doesn't make the faction viable. It takes quality units to shield as well as quality force icon distribution on cards that are unlikely to see play. The number of navy cards that are the garbage card in the set with only 1 icon is insane compared to the sith 2 icon count garbage cards.