I've read a number of the 'fixes' that have been released post 5e, and I dont think theres a single one that actually does anything to make species interesting on par with Class.
Given the historic desire to multi-class, dual-class, sub-class, prestige class and other things to really change the classes or even ditch them as folks advance, it feels like making your choice of species at the star of the game be on par with class wouldn't be that popular? I'm also not sure what it means to become more skilled at being a halfling? And I am sure that having species gates feats would just leave to a bunch of ways to have different heritages so they weren't species gates ::

That being said, was there anything, for example, in the PF 1e Advanced Race Guide that you thought approached what you want?