Exactly. Until yesterday, people might have argued that Pele/Maradona were greater players than Messi, despite Messi being way better than them (for example, I think that he is better than Maradona ever was at practically everything and better than Pele at everything except heading).
A bit like how Sir Isaac Newton being the greatest physicist of all time, despite that any modern physicist is way better at physics than him. Or how pretty much any modern general knows more about the warfare than Alexander the Great, Genghis Khan and Napoleon put together. It is the natural way of thinks, but somehow there are people (who usually have never seen Pele and co play) who claim that they were better than the modern robots.
Or take the ‘greatest dribbler of all time’ Garrincha, and check his videos. There is nothing great on those videos if you compare with modern footballers. Most of them are running straight with defenders being 5m away, followed by some crosses in keeper’s hand or Row Z. The likes of Nani or Robben, let alone Messi, dribbled better than him. Or go and check the decision making of the past greats. Massive disappointment.