Some queries regarding EB's units...

[Rolling Thunder]

Chain mail is highly vulnerable to blunt trauma. Internal bleeding is a big issue.

Not so much if you consider chain is always worn with padded armour underneath it.

Linothorax has been tested by reenactment and found to be quite resilient to thrusts and blunt trauma. Furthermore, chain mail would actually be weak against a thrust since the rings could split, but it is generally better against a slash - quite good, in fact. Reinforced linothorax is quite excellent armor as well due to the iron banding or scale. As such, reinforced linothorax is equal to chain mail.

The hoplites have helmets (which are Attic, not Corinthian) with cheek-guards, plus two greaves, plus reinforced linothorax and hence the higher value. If anything, it seems we may have made a mistake and that the hoplites armor value should be 12, the triarii 11, and the cohors reformata 10 since they lack greaves.

The linenthorax is excellent armour, no doubt. It's light, cheap to make and resilient, like you said, to thrusts and blunt damage. But the thing is, so is chainmail. Not to the degree it is against slashes, which it's pretty much invincible against, but I would be fairly confident in saying it's generally superior armour by a more significant factor than 1 or 2 AV. The iron or scale banding on reinforced linen armour is only around the belly region in EB, which would offer less protection still than a full haubergon or hauberk. That said, I would agree that it's equal-ish to chainmail armour.