Fair enough, I still disagree.
It might fit the letter of the law but i think its very much against the spirit of the rules.
I'd wave play on and encourage him to stay on his feet if given a chance like that in future (he easily could have imo)
Yea, you could change the rules I guess, to maybe force attackers to try to stay on their feet more. But that would also sort of give an extra advantage to the defenders, and I'm also not sure how fair that is. Defenders should look to block the ball, not the player. Neymar, as much as he looks for contact, is also the most fouled player in the world because of how technically gifted he is. So there is a balance. Sometimes he would trick the ref into giving him an easier foul, other times he is brought down and gets nothing. There's at least 20 penalties Neymar should have received in the last 2 seasons and got nothing.