Why is Bookmark Simulations closing?

The aging platforms that the Bookmark Draken models run on – Lockheed Martin Prepar3D and Microsoft Flight Simulator X – have become less relevant since Microsoft launched MSFS 2020. Porting the existing models to MSFS would require a lot of time and effort, and I simply do not have the skills nor the interest in aircraft and flight simulation that I had twenty years ago when I started the Draken project. I believe that letting go is better than making a half-assed attempt that will take years to complete (if ever).