

Yeah h264 is the base codec (also known as AVC), x264 is the dominant encoder that encodes in that codec. So the base BDs are just plain h264, and remuxes will take that h264 and put it into an mkv container. Colloquially, people tag WEB-DL and BDs/remuxes as “h264” as they’re raw/untampered-with, and anything that’s been encoded by a person as “x264”. Same thing for h265/HEVC and x265, and same for h266/VVC and x266.
Screen-sharing is part of chat apps nowadays. You’re fully within your rights to stay on IRC and pretend that featureful chat is not the norm these days, but that doesn’t mean society is going to move to IRC with you. Like it or not, encrypted chat apps have to become even more usable for the average person for adoption to go up. This reminds me of how all the old Linux-heads insisted that gaming was for children and that Linux didn’t need gaming. Suddenly now that Linux has gaming, adoption is going way up - what a coincidence.
Edit: Also for the record, I have a tech-savvy friend who refuses to move to Signal until there are custom emoji reactions, of all things. You can definitely direct your ire towards these people, but the reality is some people have a certain comfort target, and convincing them to settle for less is often harder than improving the app itself.