It seems that there is a severe miscommunication here.
I posted here in the "Development > New features" as a suggestion (NOT a request, just a suggestion) in case anyone is interested in implementing this solution from x-plane that improves realism (it looks more spherical/circular and not square or with straight lines at the horizon) and reduces resource usage (since you don't have to load so extreme LOD ranges anymore).
I also thought that what is needed might already be in the flightgear code base, I am referring to the space view of the earth globe which I was thinking that maybe could be adapted to this.
I assumed that people would already know what I am talking about, I assume you already follow development of other flight simulators for ideas.
This was NOT a message for requesting support, those screenshots are NOT how my flightgear looks like, this is how my flightgear usually looks like, with a LOD range of 160km.
It doesn't look as great as Thorsten screenshots but this is the maximum my PC can handle.
After using both x-plane and flightgear I feel that the solution from x-plane looks better and more realistic and uses less resources.
It's more obvious if you actually use them both, in screenshots it's not that obvious.
I made those screenshots with those settings because that is the default flightgear LOD bare range and also because it was similar in range with the "official" xplane screenshots I found after a quick search and also because it shows the difference in a more obvious way.
So this was not about me requesting support or about xplane vs flightgear.