It's the same with the other sports though, but they are more stop/start so easier to pick up on. If they get a clear hit to the head they get assesed, might make VAR worthwhile and give them something to do the rest of the time. And if someone abuses it, a massive ban and fine.
But David Luiz was assessed and passed the concussion protocol, so I am not sure what 'else' you can do. Unless it is a more extensive test and you allow a concussion sub which they are trialing in the FA Cup this year