That's... why?
I can understand slow games like EuroTruck or Farming Sim. But what's the point of this?
These days it's pretty unusual to think of an idea that hasn't been done yet, so when you do, I guess you just don't think too much and go make it.
Every once in a while I would put Flight Simulator 2020 on my desktop and work on my laptop. I found that watching the digital world pass by while working put me in a slightly different headspace. Not sure it increased productivity but working while sitting in an actual plane does provide me a bit of focus.
Train ride videos on YouTube scratch some of the same itch.
Slow? There’s a Faming Simulator competitive esports league (because of course there is). You can find videos on YouTube.
Might be helpful for people who have never flown.
Nonwithstanding the human fascination with simulation and simulacra, Airplanes and Air Travel represent a fascinating cultural touchpoint with much insight and depth to plumb depending on what aspects you simulate.
For example, think of a history class charting flight from the Wright Brothers, through the Golden Age of Aviation, right to the present day. Even showing the drastic differences pre and post 9/11 by reference to the processes and experiences of commercial airline travel would represent a worthy pedagogical endeavour. We do a lot more to achieve a lot less in terms of making 'history come alive' currently.