Yep it's a shame, because the device is near perfect for a long term 5G phone.
The key thing to remember is we wont see big changes in preformance until mmwave comes.
I guess that is the question though: will this phone really reach the point where usage will saturate sub-6ghz 5g before this device is effectively outdated? I don't think there is a one-size answer to be fair, but I guess more of food-for-thought.
And given the short-range of mmWave seems to only lend itself as suitable for built up areas, it seems like it is only gonna be a nice-to-have in city centers for a few years yet, so is it really a major bummer that it probably won't have it?