Edit: As several answers point out, snow is being cleared, just not all the way to the asphalt. Which is what I meant as well, apologies if that wasn't clear.
There are people ready in all corners of the country, city and countryside, to work on clearing the roads when it's necessary.
You can find maps and road prioritization per Län here: https://www.trafikverket.se/resa-och-trafik/underhall-av-vag...
The lowest priority roads on the map (gray) state: After 3 cm of snowfall, the road is expected to be cleared inside the following 6 hours.
However, in the northern parts/and or rural areas, you have a layer of packed snow/ice during the winter season. Snow is still cleared regularly that fall on that layer, but the underlying asphalt/gravel isn’t revealed during winter.
The E10 is the main highway connected Northern Sweden and Norway, and it gets a lot of truck traffic.
I have been living in north Sweden all my life, in tiny villages with 100 people and cities with 100.000 people. They all do it. It might even be better done in small villages because they will use local companies that live there and does their hometown on contract every year.