My 2cents would be to ask your dealer that tells you to use canned air to take you to their repair area and show you what canned air they use for repairs. My experience bets that you will not see any canned air. If you do, maybe that should be a warning.
I also would not base usage on what schools or government offices or any other publicly financed business uses...they have an unlimited supply of YOUR tax dollars to buy replacement machines whenever necessary (and even when not necessary) so using whatever is easiest is going to be their choice.