Well I have to agree to kirbysback point. Ever played Plants vs Zombies with voice chat on? No thanks. But a solution similar to Destiny would be feasible, joining into a channel manually (obviously named spank my spam dude). :-)
The alignment towards the Xbox buttons is a nice thing IMO, favorable over a PC-like line. But overall some fine-tuning will be needed, to improve the maximum visible space. Simple things like turning not used slots invisible instead of black.