Earlier this month I narrated a short vlog about using bullets to make your point, especially in an email. To be honest, I can’t think of any reason NOT to use bullets in email. It’s absolutely freeing. You don’t need to write complete sentences. You can avoid most punctuation. Just put your thoughts down behind a bullet and most readers will forgive any manner of misshaped sentence (within reason, of course).
Here’s that video:
If it’s an orderly process, use a list. If it’s a list of reasons why you want to do something, use bullets. If it’s an email you’re writing, use one or the other!