Personally though, I’d buy a trackpad only deck (maybe with a real d-pad) but I know I’m in the minority on that one.
I can't understand this. There are a few fans of the original Steam Controller (I have one too from launch of it) and they seem to be okay for the missing d-pad. Maybe if you play games where d-pad is never needed, I can see it. But games like Fighting Games, classic Platformer or anything that requires precise single clicks (even menus, like RPGs) are better with d-pad in my opinion. And if you are a fan of emulation like me, then there is no discussion, a d-pad is a must.
Do you really never use the d-pad?