Yeah, but Seaponies probably could be updated to fit with current canon better (like the fact that they and hippogriffs are in fact the same species, and they use a chunk of magic pearl to change back and forth), Changelings could be updated to align better with the recently published Wayfarer's Guide to Eberron changelings (which are far simpler mechanically), and Kirin need to be overhauled completely (being that they are now canon, and do not resemble the fanon in any way). Yaks are probably fine as is though.