IIt's what people remember and what stays in their memory - more so than winning trophies.
True, for instance everyone remembers and eulogises over many sides who didn't win the World Cup or Euros, because they were beautiful to watch. Some examples of teams who are loved despite winning nothing are Netherlands 74 and 78, Hungary 54, Brazil 82, Czech Republic 2004.
These teams remain etched in football history and the memory because they played the game it should be played. They didn't win, but everyone knows that winning can be fine margins. What isn't fine margins is the skill they displayed and the joy they brought to people (in a football capacity, which as I have said in lewy thread must be placed in its proper perspective).
Nobody remembers half the teams who beat them to tournaments who were ugly to watch and played the percentages and/or cheated (eg West Germany 54, Portugal 2016 and Greece 2004). Credit to them for winning but sometimes the poorer teams win and the better teams lose.
Neymar is like that. He doesn't have as many cold hard facts and achievements (boring, you can't be entertained by numbers) as, for example, C Ronaldo does. But what he does have is a beautiful way of playing that nobody will ever forget. The guy is a fud really, but as a footballer he was the embodiment of 'the beautiful game'.