Hmm, not sure I'd agree. I've seen no improvement at all to be honest. All that's happened is the errors are now more pronounced than they used to be.There seems to be a lot less errors than there used to be before VAR. Just a lot of teeth gnashing because everyone expected perfection when it came in and forgot there’s still humans involved.
You also can't celebrate a goal for 40-50 seconds after a goal is scored in a lot of cases.