Linen Armour?

[keravnos]

Simple. After Romani conquest, not much money went into "linothorax" or other kind of weapons (sarissa for example) that could potentially be used against them. In fact IIRC, for those weapons that would be constructed in Greece, only Romani techniques/knowhow was used. As a result, in two or three generations, the techniques used were forgotten and thus we can only speculate on its worth, both for Linothorax and Sarissa. Linothorax is VASTLY underrated/underestimated though.

Lighter missile units as standard Romani operating practice largely went completely unarmored, or using only armor they would provide, IIRC.

Later on, at the whims of a Romani emperor, 15.000 Makedonians were given Sarissas and linothorax. So, to my mind at least it was more a matter of practicality rather than linothorax being useless.