I dont' regard it in terms of right or wrong either, one can just try to make things easier for oneself by choosing methods which demand less force or other trouble for the same output and the "bowing" routines practised with squeezeboxes no doubt offer such options.
Many concertina players merely pull until they run out of air and push until doing so again no matter what the piece of music says about it, and strangely enough several tutor books give the direct advise doing so. Definitely a great deal of dynamics and expression is lost that way.I believe that the necessarily more intensive push/pull activities when playing Anglo compared to unisonoric Duet or English may automatically stimulate more rhythmical or bouncy playing styles - like typical Morris tunes.