I think that what you call "the standard RPG approach" is not "standard" once you look beyond D&D and some of its derivatives or games it inspired.What do you think?
In Marvel Heroic/Cortex+ Heroic, (i) every character gets a reaction against every action, so there is no "round robin" in your sense, and (ii) in many cases multiple foes are bundled mechanically as "mobs".
There are plenty of other PCs in which foes get bundled, and/or action economy is not "round robin". Even in the D&D family of games, 4e exhibits this with its use of swarms.
As far as I can tell, by "trad game" you mean D&D and its offshoots. It doesn't get more "trad" than Traveller - my rulebooks are a 1978 printing. But the Traveller rules don't, in general, define the "physics" of any gaming world. They tell us how to resolve action declarations.trad games have more rules that define the "physics" of a gaming world. Both the PCs as well as the NPCs are bound by the physics of this world. If the rules say you can only shoot one arrow per 5 seconds turn, that defines the game world to some degree.
The combat rules of Traveller are the most wargame-y part of the system, but under the Ship's Boat skill description there is an abstract resolution system for escaping from a starship encounter that could be straight out of some contemporary game. It would be very easy to apply that system to escaping multiple enemy vessles (eg impose a DM of to the evasion check per extra vessel).
My DW play experience is not great, but what you say here is not true at all. The GM doesn't just get to declare that PC A is a danger to PC B. The GM introducing dangers is a "soft" move. So something has to have already gone wrong in an action attempted by A and/or B for the scenario you describe to arise.And to return to the subject of the thread (let's not derail it completely with PbtA): what's keeping the GM from either stating that a player's intention to attack that enemy orc (who has been attacked by a fellow PC a few moments before) translates into a Hack & Slash move OR telling him instead that his ally is blocking the approach to the enemy orc and he has to take a Defy Danger move first to avoid getting hit by his friend accidentally if he insists on going forth with the attack?
The system doesn't handle any of that, it is off-loaded to the GM's guidance and his narration
More generally: there are RPGs out there with cinematic combat. Prince Valiant is another that I've been playing recently. It seems odd to ask "what do people think about RPGs and cinematic combat" and then decline to talk about actual RPGs that actually have it.