This is something I’ve advocated for a while.
Because it’s actually useful for a number of things. The recurring is a key feature for it.
I’d also like to be able to set up recurring payments.
So you could bill someone for a service (say, having no adverts on Zkill) or for rent on space (if you’re into such things.) Or have a monthly donation to a service of choice.
There’s some twiddly bits like caps, but it’s all there.