I'm not sure that's true.

I believe modern wireless chargers are around 75% to 85% efficient.

That sounds bad at first, but I believe most ac-dc charging bricks are in the 80% to 90% efficiency range, so it's actually not much worse at all.

And if it really is magsafe, the "secret sauce" there is the magnets will align things almost perfectly every time avoiding unaligned charging coils.

There's still a charging brick powering the wireless charger so isn't the 75-85% stacked on top of the 80-90%? That gives you 56-77% efficiency.

ah good point, I'm not sure what I was thinking!

But will users know or care?

But aren't you going AC->DC->wireless? So it would stack

I mean...an extra 50 watts maybe? Not great but doesn’t seem like a huge deal.

How hot does a 50-watt incandescent lightbulb get? That's what an extra 50 watts of wasted power will feel like.

My house is cold, the extra heat is welcome here. I only have electric heat.

Unless you live in the tropics, electric heat is borderline unconscionable with regards to climate change.

Why is that? Your electricity might be from renewable resources. Or a non-renewable that is more efficient in total than using gas directly.

My choices are grid, solar, propane. I only use propane as emergency power backup.

I use solar power. Also, in nearby San Jose, California, they have banned NG in all new construction except commercial or multi family residences taller than 3 stories.

what's the conscionable alternative?

Wear a sweater.