I agree to a point, but I had my Elan SL race skis out on Sunday morning and I came away with a realization. Choice of ski isn't so much about sidecut as it needs to be about width (surface area). Most true SL skis are narrow. A narrow ski really wants to be on FIRM snow. As things softened up, as they usually do in the Spring, I became less and less relaxed. Nothing to do with the sidecut. Everything to do with insufficient platform. I flipped to my Hart Pulse (77mm underfoot) and I immediately relaxed. A 66mm waist just wasn't enough for the softening snow that started peeling away with high angle carving.
You can blame me for @James bad habit of spring skiing with a pair of FIS SL. Turn him on to that a few years back on EpicSki.
I came to that revelation a few years back when I was spring skiing at Taos for 18 days. Traveled with 3 pair of skis. Atomic FIS SL 158 cm., Volkl Kendo and Volkl One. I logged my ski days and the skis used. I find myself on the FIS SL more than the other two skis. They are wicked fun on the groomers and in the bumps. Round turns are a must.