We don’t yet have “marriage equality” for all, though that is the logical conclusion of the trend.
Under many existing civil laws, a man can marry a woman, a man can marry a man, a woman can marry a woman, but that’s not full marriage equality. Marriage equality requires that anyone be able to marry anyone else:
You are confusing “marriage equality” with “marriage equality under state law.”
Do you know of any legal marriages in the US in which:
A man can marry many women (at once)?
A woman can marry many men (at once?)
A brother can marry his sister? (No sex need be involved?)
A sister can marry her sister?
A brother can marry his brother?
Five siblings can marry one another?
A man can marry many women (at once)?
A woman can marry many men (at once?)
A brother can marry his sister? (No sex need be involved?)
A sister can marry her sister?
A brother can marry his brother?
Five siblings can marry one another?
A daughter can marry her elderly mother?
Since no one can in the above cases can enter a legal marriage in the US, it is marriage equality.
And on the other hand, without regard to sex and assuming they are consenting adults:
Business partners can marry for the tax benefits.
Roommates of either sex can marry for convenience.
Two widows can marry each other.
Since any two adults can consent to be married in the US it is marriage equality.