The banner animation definitely needs to stay. There just needs to be a viable way to shield swap around it in a pinch.
That does open up the problem that XHelperZ mentioned where someone would be able to loot their teammate's box
without getting their card and that won't be healthy for the game, esp for solo queuers.
Automantically taking it and doing the animation after you leave the deathbox could be a potential solution but would
absolutely require playtesting. Even if you get the swap, in a firefight where you need the swap that animation could
still get you killed when you could have clutched it up had it been an enemy box. The automatic banner retrieval there
could really hurt you.
Whatever solution you come up with, it has to be something that balances an ability to shield swap in a pinch without
doing the animation, but also does the animation when you pick up the banner and forces you to pick up the banner
before taking anything from your teammate's box that isn't for an emergency need.
"Emergency need" is also much harder to determine than you would think at first glance. Say you don't need a shield
swap, you need ammo for your gun, or maybe a different gun to replace it altogether, or a heat shield because you just
wiped the squad that killed your teammate but you're outside zone and need to pop the shield to safely get your teammate's
banner and heal up before making your way back to the ring.
Its a bit of a contradictory problem but I'm hoping there's a solution because the present system means you can't swap on
a dead teammate.