Martin, for a guess, and it’s only a guess, the 710 might avoid the expense of narrow roofing filters in favour of the wider bandwidth SDR approach.
Having “non roofing filter” radios these days in the form of an Elecraft K4D, IC-7300 and IC-9700, I don’t miss the roofing filters that I had in a K3.
When I had a QRO neighbour around a mile and a half away, on 80m CW with the low noise synth and narrow roofing filters in my K3, I still couldn’t operate closer than around 20 KHz of him. Whether that was key clicks, synth noise, etc. I really don’t know.
I guess the manufacturers are heading down the SDR route as it is more than adequate for nearly every situation, whether we agree or not.
73 Dave