Well baby boomers & gen-x will struggle to dump mail...I mean it simple and just works.
We were trying to get a community of newbie techies mostly millennials & gen-z to actively engage on a list we subscribed them too for the past 2 years and believe me, I can count no more than 10 posts mainly from we few mailing list folk...
When we requested for feedback, them gen-z cried out loud for interactions to happen on some social media app through groups or channels, and since they are the target audience and the majority, we settled for discord and telegram which they actively engage on :-).
We still maintain the mailing list though and most announcement are done via it but things are changing hey....