Yup, sometimes there are follow-up pitches if something needs more attention or didn’t quite hit the mark. That work is considered for a future cycle. Nothing is automatic — you don’t get to improve something just because you launched something. Every piece of work has to argue for itself.
Technical considerations are part of every pitch. But there’s almost always a 6-week version of anything. The tech generally isn’t the hard part — the hard part is scoping the idea down so it’s clear and concise across the board.