Manager: Here's the design for the next feature, we're ready to hand it over to the consultant

FullStackClown: Uh... okay... is it spec'd out with requirements?

Manager: Huh?

FullStackClown: Well, already look at this design and user flow, did you consider what happens when <insert edge case X here>, <insert edge case Y here>, or <insert edge case Z here>? How is the consultant going to know what to put in for business logic if you don't even know or define it yourself?

Manager: Huh?

FullStackClown: Sigh... yeah, I'm too busy right now to be a kindergarten teacher, come back in a few days once you understand how your own feature is supposed to work

Manager: ...

Dev: ...