I was just thinking about this idea. What if a military reformer did this.
First of all, the advatages of the legion and phalanx have been talked about enough here. So what if one was to combine the advantages and have units with a roman scutum shield, a gladius, and a hoplite spear (whatever they were called). Units would be organized into smaller units, similar to cohorts. Men would be in a phalanx formation, and units could link to form a solid line. Then, if flexibility was needed, they could drop their spear, draw their sword, and they are basically like the roman legions without pila.
Also, they could form a testudo with spears sticking out, like a porcipine. It would be great against cavalry.
So, what do you think about this idea? Is it good, or just a pathetic attempt at trying to combine 2 different unit types and would never work?