forest-spirit on 21 June 2016
The explanation is dumb "oh noes, what's Link supposed to do now!? It's not like he could venture out and do stuff on his own the way Zelda does in Skyward Sword."
That said the decision to stick with Link for the main series and let him be a boy is the right one as far as I'm concerned. But I wouldn't say no to a spin-off starring Zelda (just do it Nintendo. Seriously).
