One DO droplet per trellis/bedrock project?

My impression is that the Roots example project is simple in order to be easy to understand, not necessarily to suggest a preference for a single site per droplet.

I’m guessing the potential use cases are too varied for a universal recommendation of one or many sites per droplet. I’d be interested in people’s thoughts on when to do a single site vs. when to do multiple sites.

You may have already seen the somewhat related discussion here, here, and here.