not noting that FFXI community > FFXIV but I want to add the observation that:
to get to 75, you had to spend hours and hours with the same people beating the same mob over and over. mob variety was non-existent then. this alone weeded out people who lacked patience and an ability to maintain a decent personality. it also promoted conversations and actual talking in party. The amount of times I've had a convo go beyond "hi" "hello" then cut to last boss "thanks for pt" in a dungeon can probably be counted on one hand. Not saying that we should go back to this way of getting exp, just saying that the way it was structured promoted a more courteous player base.
also, I cannot imagine anyone in FFXIV looking for a "replacement" before leaving a primal group. This happened pretty regularly in FFXI when I played. Boot up the old player search, looking for LFP flag, send tell, tell location, wait for replacement, thank party, log.
as for healer charity/boredom in FFXI's dunes, I would submit that joining Titan HM DF/PF groups when you have no need for it is FFXIV's version of that.