Unsurprisingly, the tests bear out the idea that the conventional wisdom here is bogus.
In https://www.youtube.com/watch?v=wf_mIlU82Ac, Tyre Reviews tests the conventional wisdom that you should run a super narrow winter tire.
I've never done this either since the reasoning for running a narrow tire seems quite bogus (narrow tire cuts into snow better) and I actually run a somewhat wide winter (255 width on a car with 235/245 OEM).
These tests also show that conventional wisdom is wrong. Wide tires are fine.