I think you're all barking up the wrong tree by discussing rules. Cause we all know the rules are nothing compared to the power of the Dungeon Master.
So for my plan for a complete rebuild wouldn't concern itself with rules. I would...
Commission a musical about DM. Many people don't read...
Okay. Do you want resource management in your game?? Or tactical, or even strategic, thinking? Since figuring out when to resources can be quite tactical or strategic.
I think this is a topic about Procedure of Play. You want procedures that have no (or little) dice rolling and all about communication.
https://www.enworld.org/threads/lets-talk-procedure-of-play.718089/
Protip: when you're glazing a TTRPG product, you should share its name, and ideally, a link to where others can buy it. That'll translate into the people making the stuff you want getting more sales and will therefore be more incentivised to make more of it.
People can do it; they just don't want to buy a fifty dollar, three hundred page gadget book and spend up to three hours every session managing equipment loadouts.
From the rules
From what the players done
From your previous rulings
Extrapolation from pre existing things
A setting Bible
Making sure NPC (factions) act in a logical matter
ETC
I have vastly different TTRPG objectives from you so I'm quite surprised we share the opinion that the fiction exists outside the DM and can thereby dictates what the DM does.
You'd be surprised. "Faster" can meaning "stripping out important context and granularity" to some and "more thematic" can mean "impose restrictions on the DM that force the game into unwanted directions."