What do you think about the Houyhnhnm's methods of Marriage? What are the advatanges and disadvantages?

I'll give you some of the details, but you'll need to cite what you see as advantages and disadvantages. The Houyhnhnms do not mix race and will only marry another Houyhnhnm that matches in color. Their marriages are arranged by their parents, and the Houyhnhnm couples are monogomous (faithful) for as long as they both shall live.