Hiya.
After reading most of the posts I still find myself scratching my head as to what the problem is. Is it really that prevalent in games for players to say "I Move, Attack, Move", "I Ready", "I Dash", I Disengage" as the primary means of describing what they want their characters to do? If so, then this is definitely reminding me of a few threads from when 5e was first released. I kept asking people to "stop thinking like 3.x/PF/4e"...because 5e is not that kind of beast.
In all the games I've ever played (including 3.x/PF, btw), players would say "I step around the table, hack at the kobold and if I kill it, I'll continue to move closer to the far door", or "I noch an arrow and aim it to the three robed guys in the back. If one starts to cast a spell I'll shoot him", or "I run like h#!! as fast as I can to the far side!", or "Oh gawds no! I back up away from this creepy thing, just defending and trying not to get nibbled on again!". Once the descriptions were done, I'd assign an actual "move" if needed. (KEY NOTE: Description first, applicable game action second).
In the case of this thread, we have no problem with a player saying "I'm going to wait to see what they are going to do", and if I (the DM) say "Ok, after a couple of seconds and sly glances at each other, they draw their daggers"...to which the player says "So that's how it is. Ok, I'll throw a flask of oil in front of them". I honestly can't see any situation where a PC who has a higher initiative than someone else in the combat can't reasonable 'delay'. So the fact that there is no "Delay" 'action choice' is pretty much irrelevant to an and all games of D&D that I've ever played. I mean, if a player wants to do X, and there isn't a rule that fits X, then the DM simply uses modified Y or just makes something up, no? How is this any different?
EDIT: I actually kinda remember one game of 3.5e where the DM broke everything down into a 'move'. It was rather annoying, frustrating and boring. It was "Move to here", "Attack that", "Ready an Attack if he Casts Spell". Ugh...welcome to Boringville!
Honestly confused,
Paul L. Ming