Oh no, people have to consider how they engage with others’ writing! They can’t just push a “like” or “thumbs down” button! There will be social pressure against it if they try to just send around picture or video memes instead of writing something thoughtful! And worst, everyone gets to be in control of their “experience of the same message,” by using the mail client that works best for them!

All of the reasons you say mailing lists are, let’s say, “dated” are actually benefits of using them, especially when using them for engineering purposes.