Comment by chaps

Easy to use is important and it's a shame that you're downplaying that. More accessible than PGP/OTR? Sure. But maybe by a hair's width of an alligator's back.

If I am working with a source who gets frustrated by the impenetrability of communicating with me because I insist they use matrix while they're not technical and likely impatient, then that person will be much more likely to use a fallback method such as SMS or email, and they'll do it without warning. It's legal risk, period. My job is to make sure that they can share information with me as easily as possible and during a particularly sensitive period of that person's life, usually. Matrix, as a sibling post highlighted well, is too difficult for this use-case. That is an enormous failure for a use-case of sensitive information sharing.