Why is the Yak-141 so flawed and just copies the image from the sight?
Why not add a map display, radar, or a warning system, etc.
Because it’s a copy of the CRT from the MiG-29, where’s it’s only purpose is recording for training purposes.
Can you not change the MFD through key binds (or the “Y” menu)?
Lots of vehicles in the game also don’t have their IRL MFD’s yet so it might be something that comes later (if the IRL vehicle has those options).
If you have sources that show the different options available for the MFD IRL then you can report it here: Gaijin.net // Issues (just search a bit first so that you don’t report something that is already reported and known about)
A guide on how to report can be found here: ([Navigation] Technical Knowledge Base | War Thunder Wiki)