God is love Dicky and therefore God is morality. God is the moral standard. Who'd have thought that eh, certainly not the materialists who would have us look for somekind of physical phenomenon or an element Moralanium. Legalists would have the law without the spirit of the law.
Loveists have the spirit of the law.
Morality cannot be an impersonal sort of thing we are all, on a moral day, homeostatically trying trying to achieve. Be Holy says the Bible. In terms of temporal morality we are not expert at all. Now that may not sound like out fault but it is because we are talking about moral expertise which is a different domain from knowledge or skill.
Moral irrealism is a non starter because it has no power or ability for moral arbitration and as for morality being taste, well.