Maybe. But driving in snow and ice on tyres that are not safe in those conditions is not a great idea either. We've had a lot more snow and ice this winter than the last couple and the CrossClimate+ have handled it with aplomb. I'm even able to start moving from stationary uphill on un-gritted roads that are un-walkable and are essentially black ice.
A couple of times now I have driven up a road where we have to stop each morning to offload our son and tried to step out of the car and have been completely unable to stand up on the road that I just drove and parked on without fuss. Quite remarkable for an All Season tyre.
Not much difference in economy, maybe a couple of percent. I only saw a drop of 0.1 miles/kWh on my daily commute when they were fitted in September, which is near the margin for error even for a very repeatable commute.
Dry summer grip is just as good as the Dunlops and cold wet grip is fantastically better. You genuinely feel like you're driving on a dry road in the wet. Snow and ice grip seems at least as good as the Vredestein Quatrac 5 on my previous car, perhaps even better on ice than the Quatrac 5 which was more optimised for snow than ice.
Unfortunately there is no denying that the ride is quite a lot harsher than the Dunlops at least in the Tekna size, I can't speak for Acenta wheels where it would probably be not as bad.
I'm going to assume that the cause is the 95W XL speed/load rating - while they have soft winter tread they have very stiff sidewalls. Tekna's normally take 91V tyres.
I dropped the tyre pressure to 34psi and that's helped a bit, also the ride is not nearly as harsh in winter weather and is almost acceptable, while it was pretty bad on a hot summer day going to the beach for example, where you will see a tyre pressure increase of around 4 psi during the journey.
I was initially a bit gutted about the harsher ride but wondered whether I'm just a ride quality snob after years of driving hydraulic Citroen's! In the winter I'm finding it OK but I'm considering getting some Acenta wheels to put some cheap but comfortable riding summer tyres on for the summer and keep the CrossClimate+ on the Tekna wheels as a winter tyre. I haven't made up my mind yet.
But there is no denying that they perform extremely well from a grip perspective, in pretty much all weather conditions.
I think if they ever did a non-XL load rated standard 91V version of the CrossClimate+ it would be the ideal tyre for the Leaf. Unfortunately they don't at the moment.