Bald Robin sounds like an excuse for him to keep the hood on lmao.
I mean think about it, he shaves his head to go cage fighting to he can keep up with Bruce. Yet he still can't be like Bruce, and he's all sappy and insecure about it. His bald head is a reminder of it, and that's why he keeps the hood on. Boom, got a plot point for Bin right there.
Scariest thing about the Batfamily is that, number one: Batman managed to condense over a decade of training into maybe a year or less. And second: those kids stepped up and adapted to that hellish training.