This will be excellent for agencies/ freelancers working with customers on low overall budgets.
You’ll be able to set daily budgets high enough to properly take advantage of tCPA while also natively setting a monthly limit for client peace of mind.
Obviously it’s possible to do this already with rules and scripts or even just manually, but including it as part of the interface will make it much easier to explain to gunshy small businesses who baulk at the thought of a $100+ daily budget.
It will also just be a bit simpler to do budget pacing on a daily basis. Again, possible already, but a hard enforced limit will be helpful.