[Marsymars]

That feels like a bit of a trick question - as big as I am on dedicated winter tires, I think a lot of people are sleeping on modern all weathers.

So, living in Alberta, and spending significant time in the AB/BC rockies in the winter, I still think all weathers would be feasible, but I'm more comfortable with dedicated winters. (For that matter, when I'm buying winters, I'm always borderline on whether I should get studded or not.) (And as a parallel effect, with dedicated winters I can also run higher performance all-season tires during the summer.)

And if I ran all-weathers with my driving patterns, I'd still want to be rotating them yearly, so that would cut my dealer visits by half, but definitely not to once every 4 years.

And tying back to my last ICE vehicle - for the first 4 years of its life it would have been okay without a dealer visit if you took tires/oil changes out of the equation, but not for any 4-year period after that. There are just too many random little things that break down in cars over time. (e.g. after 12 years or so the cruise control buttons were getting really mushy - I replaced them myself for the cost of the $65 part, but YMMV on whether you feel a service visit is warranted when removing your steering wheel air bag.)