Loss of nosewheel adhesion at low speeds on slippery surfaces will catch anyone out if Mother Nature conspires against you. Certain aerodrome 'piano keys' can be very slippery even when only wet, let alone if the surface is contaminated. Even at idle thrust and walking pace.
Exposing pax to the hazards of freezing conditions by ordering escape chute abandonment 'as a precaution' would be the height of folly. Personally I consider the orderly deplanement using covered steps was a sound policy.