I want to buy dozens of identical tiny routers with 2 or 3 Ethernet ports with tagable switchports and/or interfaces and 2.4GHz WiFi. It should be easily available within the EU market. Detachable antennas are a huge plus. 5GHz WiFi is a plus. Gigabit Ethernet is a tiny plus. The device should be upgradeable to a vanilla OpenWrt for a long time. I don't want a zoo of different UIs in the field.
How do I make the most of that table?
By further filtering for your requirements.
Maybe I don't understand your question...
The table says explicitly the GL.iNet AR750S and GL.iNet AR300M are supported with version 19.07.4. That's why I bought test pieces. The older batch of AR300M were upgradeable through their bootloader at least. Newer aren't. Neither is the AR750S upgradeable. That's what I was told.
But the table says they are. How do I really know if they are?