Hriston
Dungeon Master of Middle-earth (He/him)
I don't actually think they considered Readied actions at all, so there is no RAI-at-the-time. Strictly literally there is nothing in the wording preventing Multi-Attack with Readied. But like I said it seems a good approach to rule that it works like PC Extra Attack.
Well, if you rearrange the wording of Multiattack into its logical equivalent it's easier to parse and goes something like this: If a creature has the Multiattack ability, it can make multiple attacks on its turn.
I don't know how likely it is that the designers didn't consider how the Ready action would interact with certain other actions that they intentionally placed into the game. Presumably, all this stuff has been through some kind of exhaustive playtest, so you'd think the issue would have come up once or twice.

What they might not have considered, however, is that we'd be looking at the actions listed in a monster's statblock and assuming they're all equivalent actions without any reference to the above cited text about what a multiattack action is. Obviously, a creature's claw or bite attacks are not equivalent to the use of its multiattack.
I think the thing to keep in mind is that not all actions are the same. Some actions are the result of an ability that can only be used on one's turn. A close reading of the text reveals that Multiattack is such an ability.
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