For me it's the latency. It's not a deal breaker, of course. It's more of a first world problem akin to I don't know, guitars? High vs low action if you know guitar "problems". There's no coding problem where it's dependent on speed of typing; programming is mostly about reading anyways. It's more about the feel of it, like we're picky about keyboards and touch feedback we get. I guess spoiled, but nonetheless...