Personally I think the UI flow is geared towards the idea that engineers don't really see the costs, they just build stuff and then management pays at the end of the month.

Often I see something that's supposed to be leaner - like Fargate is leaner than renting a whole server to run docker, right?

So it's cheaper as well? - Well, no.

Also if you reach any appreciable level of complexity, you should move to IaC - configuring all that stuff on the UI, and getting it right is torture.