However, Robson was the best midfielder in Europe along with Platini. Is Bellingham really better than Busquets or Modric or Pedri or Pogba etc. He's not even an automatic choice for England yet and how do his stats stack up? Is he more versatile than Robson? No.
I'd take him over Busquets now, not sure about Modric. I haven't seen much of him recently. I'd certainly take him over Pogba although as I said earlier I think Pogba has everything but the attitude. He isn't the best midfielder in the world though but maybe he could be.
Is he better at 19 than Robson, I couldn't say. However I do think there is often a reluctance from people older enough to see those players to accept anyone is better than their childhood heroes.
I think you can debate the talent of each as (if the same talent had same upbringing, opportunities and challenges) and that is perhaps slightly different argument. The best should still be one of the best whichever era.
However I do think if you could lift and drop a 1980's footballer into todays football and vice versa, the 80s footballer ultimately finds it harder and would be worse relatively than the current player. (Personal opinion of course).