Plenty of people with home cockpit setups who want to have everything key controllable. There's a reason FSUIPC is quite popular.
Good UI should be intuitive and useable without having to Google. If a user has to Google how to use your game then you have failed as a UI designer and should seek other forms of employment.
If a user can't naturally figure out a "user interface," it is a failed schema, but a user is expected to intuitively tap arcane key combinations, instead of little knobs with the name "windshield wiper" on them. What do you tell them about a virtual cockpit, "ok, now look up and left to the windshield wiper knob as you type 'wx+4m7'"?
Your intuitive ability to distinguish orientation directional keys, from observation directional keys, must be absolutely supernatural, however your conclusive powers seem somewhat pedestrian. Since you've defined this UI designer to be failed, there should be a better, more profitable UI, that people are purchasing instead. The person that developed MSFS
failed and needs
better employment.
Also, It sounds like software to interface home cockpits is the reason Pete Dowson wrote FSUIPC. You would probably be amazed to find out that FSUIPC forms a integration between MANY softwares and the various iterations of the MS flight sim franchise. I've never actually used a "home cockpit," besides this one. Sometimes my chair tilts, maybe even falls out from under me, when I'm in a really intense dogfight, but overall, this office chair is pretty immersive to me. I first used FSUIPC about 12 years ago, for AICarriers and was surprised to see I needed it in MSFS about 2 days after I installed it, for editing airports with ADE.
Personally, I always wonder why people stop at just the dashboard. I mean, you bolt some box to your desk, monitor here, monitor there, throttles, yoke... I'm not married, so I got a stewardess costume for my Chihuahua and I got a Rick and Morty Pass the Butter Robot that I am trying to reconfigure to deliver me coffee precisely when I reach cruising altitude.