We have to understand things in context, such as Valve supporting Linux and the impact and relevance for general Linux gaming.
I think it is extremely annoying when people make uninformed opinions on how Linux gaming is a vote of support for "Valve's PC gaming monopoly", and this and that. Such bullshit. It simply reflects the current state of PC gaming, for better or for worse. Even more laughable is when people complain about monopolies but believe Windows is the only way to go for PC gaming.
So while I am not especially excited about all these Steam Linux releases, I am happy that
someone is offering average gamers an option as far as operating systems go. And as you well say
@Gilrond, Valve has a strong influence in the gaming scene (they even make games sometimes

) and may constitute an official support for other companies to release Linux binaries with less risk.