Why not? I don't believe the concerns about the cooling, electric steering, or weight.
Cooling? I assume you plow your snow in the winter, not summer? If the Ford has enough air flow to stay cool at a red light on a hot summer day, I suspect plowing snow in the winter will be fine.
Electric steering? Snow plow or not -steering doesn't take much strain when you're moving and snow adds some "slip."
Weight? Lots of 1/2 ton rigs around with snow plows. My best plow truck is a 1983 Chevy K5 diesel Blazer. 1/2 ton and short. Handier then any of my bigger trucks since it's so short. I don't drive around all year with a plow dangling from the front. I take it off when not used.
When I'm at my other place in northern Michigan - my plow truck is a 1995 Ford F150 with a 4.9 liter straight-six and E40D. Been a plow rig since new (for private use) and has 70K miles on it. Only had two repairs since new. New oil pan (old one rusted out) and universal joints dried out in the rear driveshaft. I find it hard to believe a new Ford F150 Ecoboost cannot do what a 1995 F150 can do.