Except that’s not the case according to the Flight Simulator 2024 FAQ

For any content you purchased outside of the simulator, the Community Folder will continue to work as it did in MSFS 2020. Any content in your MSFS 2020 Community Folder can simply be copied over to the new MSFS 2024 Community Folder, and the vast majority of that content should work in MSFS 2024. For any content you purchased in the Marketplace in MSFS 2020, that content will show up as owned in the Content Manager (in MSFS 2024 called “My Library”) at launch for you to use in MSFS 2024, and the vast majority of that content should work in MSFS 2024. This availability does not require developers to sign off on their content.

Its not as easy as launching from steam

Nonsense! Often adding as a non-steam game and using proton is one of the fastest ways to get up and running!

But yeah, it’s trivial

Maybe look in the settings. There is a hotkey option to save the last X amount of time (where X can be customized)

Proton does. I switched from Mullvad for that very reason.

Reasons are usually just newest kernel/mesa/etc. Most of the time the difference is very small, and often inconsequential. However, every now and again there is a major development that might make it worth it (IE: The graphics pipeline that all but made dxvk-async obsolete)

I just installed 11 recently. There isn’t a skip button anymore. I had to enter fake sign in details for it to give me the “offline” option.

So it seems like their point may still stand.