Maxperson
Morkus from Orkus
Fair enough. One minor quibble: each action does not necessarily spell out ALL the rules for it, but the rules it does include are undoubtably...rules for it...!
Heh. That's a feature, not a bug. 5e is about rulings over rules, so the rules tend to be vague, sometimes open to multiple interpretations, or left with holes in them that individual DMs have to fill.
Sure, but IF actions are indivisible, AND each action lasts until its effects end (specific for each action), THEN if an action's duration has not ended, no other action can be taken.
Unless specific rules allow for them to be taken. The actions that involve movement include movement as a part of that action.
And if you take the view that the reason you can move during the Attack action between attacks is because it says so, this means that you cannot move during ANY action if the book doesn't say so!
As a strict reading, yes.
Note that the rule for the Attack action does not give you permission to move between attacks! There is no mention of moving between attacks in the description of the Attack action on p192.
That's exactly where the rule SHOULD be, though! The rule is entirely about moving during the attack action, so it really should have been in the attack action, not pages earlier.
/begin rant
5e has exceptionally poor rules organization that is rife throughout both the PHB and DMG. I can't tell you how many times I or another player has mentioned a rule that we are positive that we read, but when the DM asks to see it we spend much more time than is necessary scouring through the books. Why? Because it's not in the spot where it should most logically be. It's a royal pain in the rear. Right up there with the index taking more space and characters telling me to "See planes of existence" if I look up Acheron, rather than "See page 302."
/end rant
IF you take the view that you cannot move during an action without a rule saying you can (I am not of that opinion myself), then in order to move during an action is if it says so under Breaking Up Your Move (it does not, except for the Attack action) OR it says so under the heading of that particular action.
Not true. There are many places an specific rule creating an exception could be. One of those places is the action itself.
Agreed. However, it certainly does not say that you can move during this action! Therefore, with the previous assumption, you cannot move until ALL your movement has been expended, nor can you take any other action until ALL your move has been expended. So, with those assumptions, if you Dash then you cannot move(!) and cannot take any other action!
If you couldn't move during that action, it wouldn't be an action, it would be an inaction.

I agree that this interpretation would lead to 'silly'. But this position (position 1) is not that you Dodge for a moment and then stop while getting the benefit for a period of time; the position is that 'taking the action' is an instantaneous game construct decision by the player which allows the character to do the things associated with that action for the specified time. So 'taking the Dodge action' is an instantaneous event at the game table which then means that the character can dodge incoming attacks from now until the start of their next turn.
To remind you:-
1) is the position that 'taking the action' is an instantaneous player decision at the table which allows the character to do the stuff for a period of time
2) is the position that 'taking the action' and 'doing the stuff' are one and the same with the same duration.
2a) follows that actions are divisible
2b) follows that actions are not divisible
Which of these positions do you hold?
I hold that the rules are such that actions are discreet and not divisible unless some other rule or itself acts on it to allow division. I also hold that the action lasts until it is completed, whether that's in an instant, or until the next turn.
That said, as a DM I will allow them to be divisible when reasonable. I don't have a problem with Misty Step being used in-between attacks.