Displaying the HUD in the cockpit or in the external view takes away from the immersion and the amazing visuals MSFS has to offer. However especially when flying on consoles with an XBox or PS5 controller things like trim, throttle, and mixture are hard to keep track off. It would be very nice if there was an AUTO option in addition to ON/OFF for the HUD.
AUTO would mean that things that are being changed, like the trim, become visible for a moment and then disappear again. Especially on consoles that would make it much easier to keep track of things without spoiling the view permanently.
Maybe the information could appear at the bottom of the screen in the center or one of the corners, so the pilot knows where to look. Of course it might be possible to change two or more things at the same time, so it would be good if things could appear next to each other.
Another, maybe easier to implement, visualization option might be just text, for instance in the lower right corner, with one item (trim, throttle, mixture, gear, …) per line. Perhaps a little like in a chat/log, but a nice graphical representation would be prettier. Of course again with the lines disappearing, after a moment, when the value isn‘t changed anymore.
I think this is not an high priority wish, but it would be a nice improvement especially for more serious controller flying in the living room, where not everbody is allowed to setup lots of equipment. 