The wotc text is, again, ambiguous. It says "you choose the action you will take" and yet, according to the interpretation that:
No the text isn't ambiguous at all, it just doesn't allow for what you want.
I'm not sure that this is something that they explicitly considered, it is just a side-effect of their intent that the initiative order should stay in place and anything you do on other creatures turns should be short interruptions, not multi action things. Sometimes that sucks but in general I think it's the right call.
I don’t see why you couldn’t use any remaining movement. If you have 30’ move speed and move 10’ and ready an action, if the ready action was “I move away if the enemy comes towards me”. You should still be able to move the remaining 20’ you have. Same if the readied action is a dash or disengage. If you couldn’t move what’s the point of disengaging. And the remaining 20’ is added to dash.
At least that’s how I read it.
I know this is an old post, and I see that others responded to it, but I'd like to add my own point of view.
If I'm not mistaken, Readying Dash is not very useful because you cannot move off-turn. Here is the explanation from the Dev:
The same reasoning applies to Readying Disengage: you won't be able to move when the trigger occurs.
As for adding the movement you didn't spend on your turn, I don't think it works that way. If you Ready movement, you could only move up to your speed again. So, you would get 30 feet of movement when you take your reaction, not 30 feet plus any movement you didn't spend on your turn (20 feet in the example).
No the text isn't ambiguous at all, it just doesn't allow for what you want.
I'm not sure that this is something that they explicitly considered, it is just a side-effect of their intent that the initiative order should stay in place and anything you do on other creatures turns should be short interruptions, not multi action things. Sometimes that sucks but in general I think it's the right call.
I know this is an old post, and I see that others responded to it, but I'd like to add my own point of view.
If I'm not mistaken, Readying Dash is not very useful because you cannot move off-turn. Here is the explanation from the Dev:
The same reasoning applies to Readying Disengage: you won't be able to move when the trigger occurs.
As for adding the movement you didn't spend on your turn, I don't think it works that way. If you Ready movement, you could only move up to your speed again. So, you would get 30 feet of movement when you take your reaction, not 30 feet plus any movement you didn't spend on your turn (20 feet in the example).