In the Tomahawk, the POH clearly states that in the approach carb heat should only be used if there is an indication of icing. (which can be checked for on downwind and then the control left well alone) It also states that full throttle operation eg go around with carb heat on can cause detonation (the tomahawk has no accelerator pump).
Yet still instructors tell students to apply carb heat on base in a Tomahawk....
What I'm trying to say is, if an instructor says "there is only one way etc etc" and it's different to the POH, then be somewhat sceptical about where they got this and other facts from. Many cr@p myths are perpetuated by bad instructors and beleived by students.
Don't be afraid to question why? Or best of all..
Read the POH!