There are socialist laws that govern and assist the poor everywhere in the world, so I would attribute the claim that “fewer people living in poverty” to socialism rather than capitalism; aside from that, those figures entirely depend on how poverty is defined.

but WHY is it necessary??

Why do you think that Wayland is necessary for adoption? In my opinion it is the missing hardware drivers, compatability issues and “getting your hands dirty” while constantly tweaking stuff. Yeah it got better over the years, but most people want things to just work.