I ran two sets of wheels for quite a few years, as when I started, there were only summer or winter tyres available in 155/13. The downside I found, was that both sets get old, and start to age harden, while still having plenty of tread left.
Dec 2022, one of the valves perished and let go. It got old, faster than the tyre. That ruined a winter tyre, and with them about 7 years old, and definitely not performing as well as when new, although still significantly better than the summers in cold weather, it was not worth buying one new tyre. So sadly, scrapped the other three as well, and ran the summers for 18 months, to try to get some use out of them. Earlier this year, got a set of all-seasons. Performing well, in all temps so far. If I lived further north, might still need dedicated winters.