There is no scenario, ever, where you spam Benefit/Cure 1 above 26-30. The fact you say this only adds further credence you don't understand how Diurnal works or how to deploy Regens properly. Shields aren't going to save an undergeared tank any more than Diurnals if they aren't using CDs.
In fact, let's do some simple math. At near BiS healer, Aspected Benefic will do 11,250 heal. In Noct this translates to roughly 40,000 (base heal + x250% shield) while in Diurnal it equates to 66,000 (base heal + 11,250x5). So no, Aspected Benefic shields are not in any way better than Regens. They may feel that way to the naked eye because the tank's HP isn't moving, but in actual numerical value, Diurnal is once again superior.