Oh yes it will because it doesn't reload. You end up with lots of empty/unloaded essence points which you never have the time to fill up unless you spend 50 turns doing nothing. The only units that benefit from that are the children who also often reload mana end hit points thus becoming almost invincible uberunits.

I said MAX mana would never be a problem again, as in you can easily get to the point were pretty much all your imbued heroes can theoretically cast spells requiring 30 mana.

Actually having the mana to cast those spells is a different problem all together! The building which Gene1966 mentioned which increases mana regen from 1 to 3 is the only really helpful thing in this area that I know of.