Have you had it up in the mountains in the snow yet? That may change your tune.
I've heard of folks getting around alright on all season tires, but I literally can't even get up my driveway in the winter unless it's completely clear of snow, no matter how light on the throttle and feathering the clutch.
And yes, I've lived in the snowy winters of middle America most of my life, so I know how to drive on snow. The 986 is a different beast altogether.
With the very central center of gravity due to the mid-engine design and high torque at the wheels/light weight, they really like to spin right around the center of the car instead of fish-tailing. If you haven't had it in a spin yet, be cautious...they can be very tricky and hard to recover from.
On a level surface, it's somewhat do-able.
Tiptronics may be easier, too, but I wouldn't drive one of those
FWIW, I don't store mine, either. But, I also try not to drive it in the snow unless I have no other choice.