I've found alcohol stoves vulnerable to being extinguished by condensation dripping from a pan of cold water/snow, so there's that. Of course alcohol has a high flashpoint, so isn't always easy to start when cold, and packs a little over half the energy of other fuels. Then there's the limited burn time.

Contra the burn time, it's easy enough to carry two burners and always have one ready to take over when the other runs out of fuel. I suspect if you're dedicated to them you can make them work wherever. I won't argue with anybody's success.

Cheers,