Steve, I did not cut everything to the ground, but everything that I did not cut to the ground died to the ground anyway.
The winter was especially harsh. In a less harsh winter would anything above ground have survived? I don't know. It's possible, I suppose. However since these were all very young trees, I figured that it was unlikely. I did protect one tree a couple years old, cutting it about two feet from the ground and covering it with a plastic tub: bad result, rodents girdled it at ground level. I don't want the various hassles of covering, or the uncertainties of it. I'm identifying cultivars and strategies to avoid that.
And I did have a distinct further rationale for cutting most of the cultivars to the ground: doing so allowed me to spread an uninterrupted layer of mulch and/or wood chips and/or uncut fall leaves, which flatten down quickly in fall rains and seem to form a kind of tarp, or superior insulation.
If anything, I am worried about having the figs be too well naturally insulated and thereby attracting nesting and root-eating, bark-eating rodents. I want the figs to be quite cold in the winter, even relatively exposed, to naturally ward off rodents, while being able to survive to bear fruit come summer. I was conscious about that going into last winter, and nothing has served to change my opinion so far. Rather the opposite.