Casting regen before pull

[Eiz]

part of the problem is most the healers that do that either dont know what enmity/agro is, or just plain lazy.....[...] no reason at all for them to cast regen at the end or beginning of a fight.

Part of the problem about people commenting without own experience is that their theories are very limited and simplistic.

Some people playing healer roles have been playing healing roles since 8 years ago, back at the beginning of FFXI.
Before every pull you used to re-buff all the party, specially the puller.
Any action you've used to pull, even the fact of aggroing the mob, gave you far more hate than any ability casted before engage.
And that makes sense, since there is no reason why a firefly could distinguish who is the healer in a party nor to argue which ability was casted 200 yalms far in another room.
I say this because is not only about the regen thick, you can check how any buff on party (Prot, SS..) earns you hate, some times even bigger than a pulling-action.