Though Gary Illyes, a Google analyst, thinks that engines like google may well rely fewer on hreflang plus more on automatic language detection Sooner or later, for now, the tag is our greatest guess.  If none of they are made use of, Google will rely upon other signals like hreflang, https://mysocialquiz.com/story4263895/rumored-buzz-on-tag-hreflang-automatici-e-tag-canonici-seo