I use Linux Ubuntu the most on my Orange Pi 5 Plus computer and a Android tablet when not at home. These are not obscure of obsolete OS's. Why do you not have apps for them?? I have several other tablets too. I am seldom using Windows due to the C++ coding I do on the mobile devices.
It would be VERY helpful and make these Pebbles 2 keyboards(3 keyboards) SO MUCH MORE ATTRACTIVE to USE if I could use the programable function keys as you advertise.
Without these programmed function keys, there is nothing special about the keyboards. Especially when you don't have any key-combinations for paging up/down! Quite annoying!
Since I have 3 Pebble 2 keyboards, the only way to distinguish them in the Logi app is to view the switching keys. It would be nice to add a name or identify them some other way.

Why can't I assign different keys combinations to each keyboard?? I have 3 keyboards and they MUST HAVE THE SAME KEY CONFIGURATION?? REALLY??
Like the keyboards, just really need more apps on other platforms if your touting mobility for devices.

Make each keyboard individual customizable function keys.
Make each keyboard non dependent on this software if not going to support other OS's or platforms.