Is it great fun to have a tool for different conditions? uh huh
Is it necessary? ummmm, no.
"non-traditional" doesn't really adequately address the full range of ski design these days. There are skis that basically are traditional skis with a rockered tip (K2 Aftershock, Dynastar Sultan 94, Elan Spire, Kastle MX98) that ski like a regular ski, and just feel a touch short due to shorter contact length. There are bigger skis (K2 Hellbent) that have tons of tip and tail rocker and that ski nothing like a regular ski and are much more specialized. There are tip/tail rocker and traditional camber (Rossi S7, Dynastar Slicer and new Huge) that fall in between in terms of a soft snow and cruddy snow mix. There are zero camber and reverse camber skis (old Dynastar Huge, Elan 1010, Volkl Katana) that are made for softer snow but are quite versatile. Big rockered tip only skis (Dynastar LP 115, Blizzard Answer IQ) that seem to be more straight-ahead big turn skis. And, there are regular camber, regular shape skis (Nordica Enforcer, Volkl Mantra, Elan Apex) that totally rip too.
There is a lot more going on that just the shape. Construction plays a big role in terms of how a ski "skis". As has been mentioned above, the ski is just a tool, and choosing the right tool is simply finding the ski that skis well and makes the fewest compromises for the conditions you ski. Obviously, there is no one right answer, and since conditions change, we have a lot of options these days, and designs that work well in different conditions.
No real reason to be dogmatic about ski design. Most climbers I know don't get too worked up about whether Bosch or Hilti makes the better hammer drill; they just want to get the bolts sunk and the climb put up. Skis are just tools, and if you can't ski, it doesn't matter what is on your feet. I say buy what works for you!