Monks usually don't have enough skill points to take up angelus... Angelus is really useless if it's not at lv 10, which Monks got no skill points to spare and get it...
Actually, Monks cannot possibly get all of their pre-reg of 10 demon bane and 10 whatever-the-other-pre reg-is-that-priests-don't-need (signum crisis?) along with pneuma/heal/bless/agi. They have to compensate and decide what to do with the buffs since it's impossible for all of them to be maxed, and if pneuma is a worthy investment or not.
Deciding how to distribute the level of buffs, and heal, is probably Mr. HolyMunk's highest level of concern during the acolyte stage for skills...