If you hate having information delivered as text, you are never going to love mailing lists. They are not applications, and most likely never will be, since that would break the universal interoperability that makes email valuable.
However, email does support threading, and it is possible to find user agents (clients) that support it. Perhaps someone who has compared them recently can offer suggestions for whatever platform you use. (I can't, since I've been using a proprietary one for ages and don't know what else is out there these days.)
Also, you might find that some are better than others at formatting text to your liking.