FIG stands for Framework Interop Group. At its peak, it was a place for representatives of the major PHP frameworks and libraries to hash out ways for their projects to cooperate more effectively, and some of the standards - such as PSRs 3, 4, and 7, have been extremely useful.
If you're not writing a framework or library for others to use, nothing the FIG says is necessarily relevant to you.
And in fact, even if you are, Doctrine, Guzzle, Laravel, and Symfony have all left the FIG, so it has even less relevance now.
So...it's a group that used to make standards for a very specific audience, and now mostly doesn't, in part because all of the most important members of that audience got fed up and left.
That's your biggest beef with PHP? Just adopt whatever standards you like.
If you're not writing a framework or library for others to use, nothing the FIG says is necessarily relevant to you.
And in fact, even if you are, Doctrine, Guzzle, Laravel, and Symfony have all left the FIG, so it has even less relevance now.
So...it's a group that used to make standards for a very specific audience, and now mostly doesn't, in part because all of the most important members of that audience got fed up and left.
That's your biggest beef with PHP? Just adopt whatever standards you like.