Dear Michael thanks for your comment I made the comment about the old version of the article almost exactly 3 years ago see the version at that time It said Einstein Cartan 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 Einstein Cartan theory is a historically important extension of general relativity with some extra fields torsion but all the modern evidence indicates that such extra fields don t exist and they re not needed If you care about sociology no research of cosmology or calculations of NASA s experiments or anything of the sort takes the torsion field into account because the latter doesn t exist as far as the existing evidence theoretical or experimental can say Today it s not an important proposal to extend GR The new article doesn t 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 wouldn t protest against the new version Visually it surely looks like a well written article However I see some confusion in your comment that does show that the articles doesn t explain the basic points too clearly Einstein Cartan 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 Einstein Cartan theory Einstein Cartan 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 that s so one isn t doing Einstein Cartan theory