All true.
However, there has been - at times - a bit of hysteria regarding the necessity of deicing. In order to remove just a hint of rime, hundreds of gallons of fluid are routinely applied, often leaving the aircraft covered in a yellow layer of type II that far exceeds the amount of the icy substance removed.
Three legs and 10 flight hours later the gooey stuff is still dripping off the aircraft.
And once in a while we are all surprised by unexpected side effects, such as the congealing glycol residue found in tail surface control areas a few years ago. Nobody noticed, until a few drivers had trouble rotating.
If the wing surface is cold and the air is dry, then the snow will not adhere, and it can easily be blown off, as is evidenced under windy conditions when during an average 30-45 minute turn your wings will be just as bare when you leave as they were when you arrived, despite heavy snowfall.
Which of course is not to say that you should commence any t.o. roll with the stuff piled high.
But why someone hasn't come up with a portable semi-high-pressure air-hose-thingy that a couple of guys could do their rounds with and dust off planes at the gate before departure (and then you could check for clear ice) is beyond me.