If we're talking DPS, it was a DPS loss to not generate enough enmiity for your blm's triple flare or the smn dots building aggro during your pulls more than anything regen did. WAR also had invigorate to mitigate tp issues, brd could sing for more Regen and HW gave you equilibrium too if you honestly needed it but invigorate should handle your tp issues for pulling - if you had any.