It does already stream to tv or monitors at the correct ratios. How are you trying to ‘stream’ it? As you’re putting it in inverted commas I assume it’s a non standard way?
On MAC, I use DLNA/UPnP software to stream movies. Or Airplay 2 works too, but it is lower quality.
If I select Airplay 2 on the iPad, it only sends the audio to my TV. So the only option that works then is “screen mirroring”, which has a bad screen ratio.
The technology is there, because the iPad can stream embedded videos from websites to my TV correctly if I click the Airplay button.
But I posted this in the wrong forum, so it will get deleted by a mod soon.