The league is also far softer today and has rules tailored for offense which artificially increases player's skill exhibition.
Tons of players have played with injuries throughout their careers by the way, scored 100+ points doing so as well.
There's not any players that put up the scoring rate McDavid just did in the playoffs other than Wayne and Mario, and I don't think Wayne and Mario could even do it today against today's D and goalies.
The fact that on top of that, this was not really a "everything is going right for McDavid!" kind of year because an injury basically crippled his ability to properly shoot the puck, his goal scoring rate this past year and even playoffs was the 2nd worst of his career.
Imagine what he could have done if he could actually shoot the damn puck, lol (64 goals last year down to 32 this year, only 8 goals in the playoffs, he had 8 goals through 2 rounds last year).
IMO that shows he is a Gretzky/Lemieux tier talent. I don't think anyone else since Wayne or Mario could do what he just did this past April/May/June, again I'm not even sure Wayne or Mario could do it in the modern league.
This guy's a remarkable talent.