When to use it
Use it when you have a suggestion and the discussion is going in circles. A recommendation with one reason attached is easier for people to agree with, push back on or improve than a hedge. You can still be wrong; you've just made it easy to discuss.
Example
You: “I recommend we pilot the new form with one team first. Here's why: if it breaks, it breaks small.”
Colleague: “Makes sense. Which team?”
In an email or Slack message
In writing, put the recommendation in the first line and the reason in the second: “Recommendation: pilot with the support team first. Reason: lower risk, faster feedback.” Then invite objections by a set time.