as much as i love Matrix: it is not a suitable alternative to Discord for non-tech people, and my friends will never switch to it, and i think it would behoove tech people to be a lot more humble about this. many people--most of my friends included--will sooner to switch to what comes after Discord than Matrix, and if need be i'm almost certainly going to follow them (although my main community will probably switch to a forum if i get my way).
in fact: my own first experience with Matrix ended in an account i can't use anymore for inscrutable reasons i don't understand, and getting restarted ate a ton of messages someone sent me that thankfully weren't too important. not a great first impression! comparatively i have never had issues with Discord on any meaningful level.