My least favorite thing about recent monster books (A small rant)

[Psyren]

Are you suggesting the damage output is the only thing that matters for any given creature?

No, of course not. I'm saying that a creature's CR is based on its most dangerous actions, and their goal of making that CR less variable depending on DM whim/attention span is a good one.

Streamlining the statblocks makes those most dangerous actions harder to miss or misuse.

(Note that "most dangerous actions" don't have to be related to damage output at all. The scariest ability of, say, a Siren or a Dryad isn't its damage.)