Ever dealt with a scenario where you were struggling to get a client's mail out of the spam folder at Gmail and back into the inbox? Maybe not for you, maybe not always, but in my experience, improving engagement, restricting sends to only engaged subscribers, has been a big part of what fixes that type of issue.
Others might have a different opinion. Good for them!
But that's what has worked for me, numerous times, helping numerous senders. So I, and others, will continue to trumpet it. Intelligently, of course.