@tsgas
I suspect RollingT was being a little sarcastic. Arguably, it's more understandable if an aircraft goes off a runway because of the higher energy/inertia
required in the landing. To slide off a taxiway
implies that perhaps the aircraft was going faster
than is necessary for the manoeuvre - as alluded to in your last sentence.
Additionally, if the runway/exit/taxiway is slippery or contaminated then THERE IS NO "KEEPING THE SPEED UP!"
I was asked to "expedite vacating!" by Spanish ATC at MAD.... on a snow covered, whited out runway with moderate snow falling where the exit was only just visible due to other aircrafts tracks in the snow. If I had kept up the speed then we'd have been reading about it on PPRune! I crawl around the airfield in conditions like this simply because if it starts to slide........
why hurry?