That's all I do (blow out the lines)... My water lines are run along the floor until they go 'up' to whatever they feed.
When I open the low point drains and open all the facets that gets all the water out of the facets.
I then blow out thru the low points for several minutes until there is no more 'mist' coming out.
Give all the facets one more go around and call it good..
Oh yeah, don't forget the toilet and give the pump a run for a minute to get any residue water out of it too.
I've never used the pink AF. Now, my area does freeze at times, but not for very long stretches or below zero or anything like that.. Never had a broke water line in over 11 years.
Most folks will do what is comfortable for them and if that's just blowing that's their call. If they like the pink AF, that's fine too.. That's why they have different ways to accomplish the same thing!
Good luck with whatever method you choose! :)
Mitch