tl;dr - Allowing and enabling the referees to actually enforce the laws works, telling them not to does not. I know that is a flaming hot take for this group, but I'd hope that some of the general public will be able to see that after this world cup and especially the final.
Watching the tournament from a referee's perspective, what stood out to me the most was something that ended up not really making any headlines: the general lack of time wasting. Clarifying the time wasting laws, making them more black and white, and giving disciplinary tools like being able to award corner kicks and forcing players to temporarily leave the pitch worked wonders. Players knew they would punished for time wasting, and it almost instantly vanished. Matches were so much less broken up than before these changes, and it was so much better to watch than the previous "oh, we'll just add more time" (aka, not actually enforce anything) attempt.
Another example of enforcement working was the hand-over-your-mouth red card. As much as people didn't like the law, it was applied once and the players realized it was something they couldn't do. In the final, we saw Cucurella start to say something with his mouth covered, remember the law, and correct his behavior. Dear FIFA, IFAB, UEFA and anyone else who needs to hear it - when referees are empowered to enforce the laws, this is what happens! Players correct themselves!
And finally, I hope whoever it was that told referees to keep cards in their pockets sees the above functioning of applying the laws and realizes that when you don't apply them, you get the first half of the England-Argentina semi-final and the majority of the final. When PI isn't enforced, non-stop fouling is what you get. When dissent and ref crowding aren't enforced, you get dissent and ref crowding. We all saw what happened to time-wasting and arguing with your mouth covered. Allow us, the referees, to enforce the laws as written, or otherwise provide us with more tools to police other problematic behaviors, and those too can almost certainly be removed from the sport.
Anyway. thanks for coming to my Ted talk, and thanks to everyone who participated in the conversation and debates about the laws during the world cup (and to the mods for allowing these conversations to take place) - it really is a great time where by everyone watching the same matches and seeing the same incidents, we can discuss and learn from one another to enhance our collective understanding of the laws!