Hah, really? If you enter recovery mode and install an OS via network it installs the OS the device originally shipped with, right?

On an Intel-based Mac:

- If you used Option-Command-R to start up from Internet Recovery, you might get the latest macOS that is compatible with your Mac.

- If you used Shift-Option-Command-R to start up from Internet Recovery, you might get the macOS that came with your Mac, or the closest version still available.

https://support.apple.com/en-us/102655

Ah yes, of course I can install an older version. I meant that it won't get new updates to future (and hopefully better) versions :(