If only the container was an issue, you would have a direct stream which doesn’t impact quality, it just repacks it in a container that is compatible with the client.

You can see the transcode reason on the dashboard by clicking on the i symbol. Start playback on android TV, open jellyfin on your phone and you should see the transcode reason.

I would be shocked if I install an OS and couldn’t open media.

Choice is good but giving a direction is also a good idea. Maybe they could introduce a media pack of some sorts.

Screencap / screenshot tools should be included by default tho.

I think on windows you can set that in the network driver options irrc. Either in the nic configuration or the ip stack config. I’ve at least seen it while I was diagnosing network issues a few years back.