You can keep banging your heads on the wall trying to change other people's aspirations and aims in a mmo, or you can accept that the FFXIV community (like most communities) is diverse and that people play for different reasons.
There are no people standing on the aoes on purpose to ruin your lives and there are no people ignoring share damage mechanics as long as they notice them.

I said I'm familiar with the kind of player profile that just "harmlessly offers advice" when on reality most of the times they are nothing but people with temperamental attitudes (or a bad day). Perhaps the TC is actually not among these people and he/she is legit concerned about the average level of the players in this game? Possibly. But understand my skepticism when my experience has told me otherwise throughout all these years.