Dear Michael thanks for your comment I made the comment about the old version of the article almost exactly  years ago see the version at that time  It said EinsteinCartan theory in theoretical physics extends general relativity to handle spin angular momentum correctly at the very beginning and the whole article was written in the spirit of the claim that general relativity without extensions describes the spin incorrectly As far as I can read this is no longer claimed by the article EinsteinCartan theory is a historically important extension of general relativity with some extra fields torsion but all the modern evidence indicates that such extra fields dont exist  and theyre not needed If you care about sociology no research of cosmology or calculations of NASAs experiments or anything of the sort takes the torsion field into account because the latter doesnt exist as far as the existing evidence  theoretical or experimental  can say Today its not an important proposal to extend GR The new article doesnt make these points too clear but at least it also no longer makes crazy claims throughout the text that general relativity without torsion is inconsistent with the spin or something like that so I wouldnt protest against the new version Visually it surely looks like a wellwritten article However I see some confusion in your comment that does show that the articles doesnt explain the basic points too clearly EinsteinCartan theory is not just about the tetrads Tetrads are indeed useful  and in some formal sense necessary  to describe spin in General Relativity However using the tetrads formalism is not yet EinsteinCartan theory EinsteinCartan theory assumes that torsion may be nonzero  even though it is identically zero in general relativity which normally uses the metric One can write GR in terms of tetrads as well  and the torsion is still zero If thats so one isnt doing EinsteinCartan theory