A "disadvantage" could be some people thinking it's gonna be overcomplicated and prevent you from going ahead. I'd refrain from sharing you're using 5 steps and just do it. They are really simple, just good meeting practice in my opinion:
- set the stage (focus on purpose, team temperature check)
- gather data (what are we looking at)
- generate insights (so what do we make of the data? How can we work more effectively?)
- decide what to do (now what can we put in place? What's a next step?)
- close out (ensure clarity on next steps and get feedback on how this retrospective was)