Discarding/Replacing Steeds

[Duck of Doom]

I assume Steeds (as Items in general) can't be discarded just because. In consequence, I believe you can't replace a Steed with another, right?

Nevertheless, I read this from the FAQs:

Q. If I tame a monster, what happens to my old Steed?
A. Same thing that happens when you replace a Steed with a new regular Steed. Discard the old one.

From my understanding, it implies Steeds can be replaced. Maybe the answer should be changed to just "You must discard the old one"? In fact, it's what the rules say about the taming skill:

Monster Tamer: In combat on your turn, you
may tame a single monster instead of fighting it. It
becomes your new Steed. To do so, you must discard
your old Steed, if any, plus a number of cards equal to
the Treasures on the monster’s card. That number is
your new Steed’s combat bonus. You may not trade a
monster Steed, give it away, or sell it for levels.

By the way, if you are allowed to have more than one Steed somehow (Cheat cards, Centaur Race...), do you have to discard your old Steed anyway to tame a Monster? All of them if you already have more than one Steed?