I'd wager the real issue isn't simply LTE, rather LTE is a quick way to sum it up. It is the limited choice of antennas with respect to the US market. The phone simply isn't available to Sprint and Verizon users. T-Mobile users have nothing to complain about, since they didn't have LTE to being with. AT&T users however are sitting there looking at their friends with a Galaxy S3 and thinking, wait wasn't my phone newer?
I figure Google left things out because they aren't REALLY essential to what they are aiming for. That said, it looks like they are tragic flaws on paper, even if the user experience wasn't compromised. If I weren't chained to Verizon, I'd consider getting a Nexus 4. The Nexus 10, however, is definitely on my radar.