The Roman Conquest

[cunctator]

In fact, a roman legionaire was equipped for individual combat,

A republican scutum weights about 10Kg, it exhausts the legionaire very fastly in individual combat.

One can argue that terrain, commander incompetence and lack of discipline on the side of the macedonians is what won the day (rather than the famed flexibility of the Legions).

The ability to be less limited by the terrain than the phalanx is part of the legions famed flexibility.