I agree that this will resp. does not make a big difference. RedHat vs. CentOS works because RedHat charges money for support. RedHat also has far less versions and releases and supported hardware to handle. Armbian has anything from X11, accelerated 3D video, sound via IIS, USB, TosLink, HDMI and analog. Also SPI, I2C, serial ports and other oddities. Making all of those work is hard (impossible maybe even unless you have supported hardware). My take: Support some hardware fully. List the things which are supposed to work. Make sure they do. If there are problems, users can file a bug report with most data like hardware configuration being collected automatically. Everything else is not supported and if not working go to a dev forum. List all supported boards and features like the Allwinner matrix and the mainline support for the various features. Lastly make sure users with problems go to the right place: support for things which should work, or if it's unsupported, the dev forum. Also moderators moving threads to the right place helps a lot as users will pick the wrong place.