So yes this is a big issue. What we are actually waiting for the fix? Right now its really hard for alternative clients to support E2E because they are forced

So yes this is a big issue. What we are actually waiting for the fix? Right now its really hard for alternative clients to support E2E because they are forced to build the whole encryption stack up. As a consequence the alternative clients have just not matured and have mostly lost steam. The next gen of matrix mainline will be moving to a Rust based library stack that has an explicit goal of making straight forward bindings for 3rd party clients via a mostly standard C library interface (so yay for elisp, python, c++ etc) and of course the Rust libraries can be deployed to wasm for web and javascript. I think we'll get a lot more mature clients that will be more useful, because yeah... the current matrix mainline client has "modern" disease pretty bad.