I am genuinely curious as to why the difference in speeds is actually a major factor in someone's daily use. For me, the most data I'll use would be to download a movie or two, maybe an audio book, so I can use them while on a drive or a flight or something. If it takes 15-20 seconds longer to download...I'm not really "put out" by that.
I'd love to hear about real-world examples of how 252 Mbps is somehow holding you back when 317 Mbps will totally make your day. I'm sure that could make a difference in somebody's world...I just don't know who or how.
For me, the issue with cell service isn't a download speed...it whether I am receiving service at all inside my vehicle or in a building when I need it. Certainly there are certain wavelengths that could help that, or an abundance of towers, but that seems to be more of a carrier issue rather than a modem issue. And certainly that 15-20 second difference is significantly less important to me than whether I get a signal at all.