Laptops are pretty rugged, but with more sensitive stuff like prototypes or test equipment, the easy solution is to put it in a plastic ziploc bag while it's warming up.

Just leave the laptop on during winter??

The surrounding cold winds would reduce or negate any potential harm from leaving the laptop on and it wouldn't be cold enough to hurt a laptop in a sleeve/cover.

Also, this would also affect electronics transitioning from a cool/dry room to a hot/humid outside area. Such as going from cold hotel room overnight to the blazing hot outside in asia in the summer.

Are you sure this is a problem?

Have you encountered / measured it?

Get a hard case. Rip out the foam and replace it with something more insulation-y. Now you have a cooler, a cooler that’ll keep the cold out instead of in.

First World Problem

I don't know why you keep misusing Ask HN to present us completely disingenuous questions. Do you actually need someone to explain to you why this doesn't exist, or are you trying to leverage this website to validate your own, extremely specific pet peeve?