It's a silly rule considering there has been an unenforced 6 second rule leading to a free kick for decades!
Just enforce the original rule! I feel for refs, another thing for them to get wrong. The Arsenal fans will be there with stopwatches showing how it was actually 9 seconds and no punishment for the opposition and 7 seconds for Raya which led to them conceding!
However, something does need to be done as it's ridiculous at times. How many times have we seen keepers time waste against us without punishment. Even when they finally get a yellow they continue doing it without further punishment.
Football fans need to relax a little with the officials. There are issues with decisions on and off the pitch in most sports but they get on with it. Umpire's call in cricket isn't perfect. You can review a decision for one reason but it reveal another issue and still get the result you wanted which doesn't seem right either. In rugby similarly there's the call to "use it" in a ruck which should give the scrum half 3 seconds to do so, but rarely is enforced and they usually use up more time than that.
Just accept it's sport, there will be good and bad decisions even with video assistants because it's rarely black and white.