I'm pretty sure it's to make installing a GPU easier and possible. I really hope Dan decides to put a metal plate over it like the Ncase M1 does. Dan did mention he'll look into it. Just for myself, this is the deal breaker with the A4.I know this was brought up earlier, but is there a reason for the hole above the GPU bracket? Why not just have metal there, maybe a slimmer opening or a mesh? The case already lets in a lot of dust, why leave a big opening like that?