Talked too much about the solution/artifact, not enough about the problem or context.

No initial definition of success metrics, hypotheses, or assumptions

No hierarchy (not only in screen, but whole flow, whole app experience)

Happy path only — no attention to edge cases or what-if scenarios

Inconsistent UI / Interaction pattern

Not aware UX Friction Loop

Just stop at ensuring usability, not experience

Too many intention in one screen

You forgot UX writing. Words shape thoughts, and thoughts shape actions

Not seeking any feedback for user, from stakeholders

Just have one option to consider