Hypothetical scenario:
You're a medium-size fleet with a cruiser, some destroyers, and many frigates. You have a smattering of support ships for cargo, fuel, and crew.
Out in the fringes you get jumped by a pirate fleet. Their ships don't outsize yours, but their mobility allows them to quickly close in your support ships. Knowing this, your fleet is forced to assume a tight formation around those ships.
If a battle occurs your fleet will be on the field, though you can 'deploy' ships of your choice around the rest of your fleet. Without a doubt you'll want to protect your support ships and, if the fight isn't hard fought, you won't lose all the CR spent for every ship.
I think I'm a genius here: now that fielded support ships is much more likely to occur, the binary all-or-nothing strategies with them will be replaced with more meaningful choices e.g. Colossus/Tarsus to withstand ambush attack vs Atlas/Buffalo for Core trade.