Sufficiently trained professionals (like the Spartans) didn't "shuffle" either, being too well drilled and disciplined. AFAIK the RTW period is well past the time everyone (who now used such troops to begin with) learned to fix that little shortcoming in their training.

'Course, half the RTW phalanxes are pikemen anyway. To my knowledge those fellows never suffered from that habit to begin with - maneuvering with pikes without getting tangled up probably required enough drill that such issues were dealt with on the side by default.