Blizzard adding depth to the game? Mind sharing what you are smoking?
They force you to periodically change your playstyle. Both defensively and offensively.
Defensively, your weapons teams are less effective. Poorly positioned teams will freeze unless you construct firepits or garrison them (in the case of mg's). Their line of sight is crippled and indirect fire units are less accurate. Offensively you have to be conscious of avoiding deep snow (which will make your freeze faster), avoiding frozen rivers which can break or affect mobility of your vehicles. This mixes up the game: if you were on the backfoot because your opponent has an established forward position, this gives you more opportunity to flank. Likewise, defensively you can prepare for blizzards with firepits, bunkers or by placing demo charges on ice.
There's also "scorched earth" style tactics of destroying firepits that your opponent could use around strat points, which inattentive players (IE the people bitching about blizzards) will not notice and then constantly be struggling due to the cold.
Abilities that increase unit detection are suddenly 100x more valuable during blizzards. Infantry Awareness/vehicle awareness/spotlight HT etc etc. They're still useful in summer maps and non-blizzard winter maps, but their utility is greatly enhanced when your vision radius is significantly reduced.
Blizzard/Winter mechanics are one of the best additions of the game. Shame people don't fucking play around them and just bitch about how their infantry (which they repeatedly path through deep snow and never build fire pits or micromanage warmth) are dying.
I mean fuck when firepits had 35 radius people still didn't fucking build them and then bitched that their units were slowed down.