The base 50 size of the later Roman legionary units in EB1 is something of a "schtick" of theirs, but while somewhat unusual for "civilised" non-pike infantry of their quality and equipement level doesn't "break" the (AFAIK actually unwritten but nevertheless studiously enforced) quality-level to unit-size norms used in the unit design. No different from many of the lower-end "barbarian" line units of equal base "experience level", such as the Celtic longswordsmen, being base size 50.

The size caps are played to the hilt with higher-class Roman units, like the Antesigniani and Evocata.