First of all, the entire question is a strawman, why do developers choose a closed platform? Who said they "choose"? Because, the way I see it, management says

First of all, the entire question is a strawman, why do developers choose a closed platform? Who said they "choose"? Because, the way I see it, management says "we're gonna do some nonsense decision, deal with it". Developers don't choose, otherwise, consoles would not exist by now. "you are also targeting a single set of hardware so the QA is easier and the dev process requires less testing." Are you serious? You mean to convince me every developer wants to take yet another hipster sdk, one for xbox one, one for ps4, one for xbox 360 and develop for each and every one because it is easiest? Instead of just developing for single linux desktop and reaching linux pc market + consoles and optionally cross compiling to windows from linux too? What kind of crack are you on mate? Steam machine is better in every way than a gaybox and homostation, everything you get from a pc - free internet, cheap games, same online multiplayer for console or a pc, way beefier hardware than a console, even upgrade options, yet people say that steam machine is lacking something?