For what it's worth, I don't really understand the "confusion" of our use of the word suction either. It seems like a word that describes -- casually -- what happens with a vacuum. If I use it to say "here, suck on this straw," it doesn't necessarily mean I don't understand physics, and the term "suck" doesn't confuse me.
If you are checking out vacuums in a store, and one picks things up much better than the others, what do you say? I mean, if you were completing the sentence "Let's get this one, it has great...."?
Even if you do use another term, I don't see the use of suction as confusing to English speakers (?)
Always fun to talk about words and concepts though, I agree.