Normally I would agree, but in the example above "Why the f*ck are you playing BLM, go SMN." Is neither helpful, or even criticism. They did not explain WHY they should go SMN. They didn't explain WHY BLM was a poorer choice. They just berated a guy because they saw a Job icon. You also bring up how communication is needed in Feast. Have you perchance tried Feast for your GARO mounts? Any of them solo?
You sit there and look at the BRD, SMN, AND BLM all with 300+ medals over-extending and not a single person targetting them? You mark them and their health never drops? even WITH chat, you can only spam "Attack X" so many times. How much tolerance do YOU have for being ignored? My tolerance is rather low after 5 minutes.
Not to say i disagree wholly with your points, it's just that helpfulness from the PvP side has always been out of matches much more then in matches. there's just not enough time to type out a new strategy once there's 1 minute left, especially "nicely". With the ban in Feast, it's now EXCLUSIVELY out of matches...