Too early to tell whether it's a real-world issue or not. In practice, I just spent a bunch of time working in a remote area where I was tethering my 7 with Intel model with barely 1 bar of LTE. According to the tests, this is where the Intel modem should have struggled, but the connection was still so fast that it performed basically like my home 50Mb connection. And if anything, my connection seemed more reliable than my co-worker with a 6s+.
Interesting. And some people believe intel radio may yield better battery. If true that's worth the alleged trade off