I used to have an evergreen sequence.
I stopped doing it because I was teaching a technical topic, and sometimes parts of got out of date. Plus I like being responsive to people's needs, which broadcasts are great for.
So now I have sequences for shorter email courses that take someone from A to B. They'll either opt into those from the website, or a trigger link in an email. And then broadcasts.
I'm also thinking about a hybrid system with a mix of long term evergreen sequences and broadcasts. I think that would work really well.