I think that it would be better that flag holders can eat speed berries. Here’s why:
Firstly, it would make it a little more fair for flag holders on maps with teleportation stations, and also just make it easier to run away from a non-flag holder that doesn’t have the slowness effect. Also, before anybody says “You can technically eat the berries if you drop the flag and then pick it up again” yes, you can, but it’s a bit tedious. Why? (A) many people don’t even know how to drop the flag (I didn’t till I had played the game for months ). And (b) even if you do know how to drop the flag, it’s a bit hard to pick it up before it gets returned.
Anyway, that’s just my opinion. Make sure to vote if you agree.
Have a great day