@reconzeromost of us are not paying attention to that 15 seconds screen because it is so boring and repetitive and a game can be like 20 minutes of needing 100% of your attention so the in-between is where we go for a pee, make ourselves a drink, answer our messenger, go flip a bit on tinder, take a mental break, etc.
This is pretty much the only BR where they can take your choice of legend from you... so it makes so much sense to have a simple fix where you have a 2nd pick that you can change depending the type of gameplay you are doing at the moment.
I mean we already chose the legend we want to play in the lobby... it is the game that punishes us by having someone else have the ability to take it from us and having only 5 seconds to react if you were already staring at the screen like an idiot.