If done = shipped without needing to measure if it met an outcome, research can be skipped, but when would you want to to do that?

You need research and strategy to:

• figure out the outcomes you need to meet,
• where you're at with each outcome
• and to measure how your solution did

Agile Development Is No Excuse for Shoddy UX Research

Create better products by using remote research sprints

How to Stop UX Research being a Blocker - Beaker & Flint - Medium