Bump! This is something that needs addressing, no doubt.

The only useful aspect I can find for the castee automatically targeting the caster is the eventual tell or emote to thank them for a timely cure or buff.

But like the OP says, maybe there's another useful aspect to it. If there were need to keep this functionality for some reason not clear to us right now; and If the D. Team were more into using the targeting commands prevalent in FFXI (like <bt>, <lastst>, etc.,) one could imagine the auto-targeting feature being replaced by macros with the targeting command <lastc>, or anything equivalent, to target the last player that cast on you.

R