No reason to change. The whole point of the flag system is that you, as a driver, doesn’t have to rely on just your own eyes. A blind corner is safe, because there is a warning system in place. Any yellow flag means slow down, simple. In the case of qualifying, this means you won’t be able to set your best time.
If we allow drivers to interpret if the track is safe or not, with a yellow flag, we are asking for problems.
Good call from the stewards to penalise Verstappen.