I have a couple RPis and they are fun for out-of-the-box projects like RetroPi, but it's a BBB that I trust to run my 3.25hp router around my CNC table at 200in/min. Though, recently with the work going into MachineKit that's pretty much an out-of-the-box project too.
RPi had quite a bit of energy in the community to begin with and that momentum still persists and give a bit of an advantage to them in project development, but that will only go on so long with the arrogance displayed in that thread. Don't venture into the OSS space and start complaining about derivatives of your work. Especially when the project is mainly sponsored and developed by employees of the company that is selling the bloody chips that are nowhere near open or documented while all the function of your system is dependent on an OS you did not develop or pay for.