This is a pretty strong statement for a simple policy on a complicated set of issues. Open borders are cosmopolitan but they also rely upon a very specific set

This is a pretty strong statement for a simple policy on a complicated set of issues. Open borders are cosmopolitan but they also rely upon a very specific set of culturally rooted practices, laws, and civic institutions (unless we will have a global vote on these things?). They are egalitarian for people across communities but they do nothing to address existing inequalities within communities. (One could also say that if we are going to be truly egalitarian we need to guarantee a basic set of economic benefits to all people). This kind of policy prioritizes a certain set of rights for a certain set of people without troubling itself over the health and well being of existing communities and their right to exist (the widespread complaints about gentrification don't come out of nowhere). I frequently see people say things to the tune of 'if you can't afford to live in a high cost of living area then move'. That's great advice if one place is as good as the next, but if you were born in said high COL area and your family is there then it is a pretty callous suggestion. Immigration is generally a good thing, but it also comes with costs and downsides. A sensible policy on immigration should take these concerns into account.