The Max Verstappen/George Russell controversy at the Spanish Grand Prix could all have been avoided if the stewards were still following the rules of a few years ago.
The whole controversy was caused because Red Bull had to guess what the stewards' decision would be regarding George's collision with Max at turn one. The team guessed, incorrectly, that Max would have to let George past (as it turned out, the stewards decided otherwise, because George was not in control of his car when he hit Max), and this is what angered Max causing him to get an attack of the red mist.
Under the rules of a few years ago, the stewards would have advised Red Bull, and Mercedes, that there was no need for a position swap. George would still likely have overtaken Max at some point, but Max's resultant angry move into George could have been avoided.
To go into more detail, a few years ago the stewards used to inform teams when they needed to let a driver through or give the place back. The teams had to follow this instruction, otherwise they would get a penalty. Similarly, if there was no need to swap positions, then the stewards would advise the teams of this. Now though, stewards don't advise the teams, so instead the teams have to guess what the stewards' decision will be. Given the number of variables involved in a decision, that means you have teams and drivers having to guess who was ahead at the apex (and where the apex even is), whether drivers were in control, whether they left enough room, etc. They basically have to guess the stewards' decision.
Imagine if in football you had to guess whether you were offside or not, and if you were offside but played on, you got a yellow card. It would be ridiculous. Well, that's formula 1 right now. They need to go back to the standard of a few seasons ago, when the stewards would tell the teams whether they needed to give the place back, rather than the teams having to guess.