People improving over time, shocker.
The only way to compare is against the equivalent of the day. For every player you say has advanced now, and the reasons behind it, different methods, equipment etc, the same would apply going forward or backwards in time. For instance, the modern players would be playing on dire pitches with much heavier balls and practically a different rule set.
I still think there'd be some 90s players I'd have in this team over current players, and the general consensus was none of them would've been good enough to get in the more recent (at the time) all conquering 80s team.
It is a fact that the general levels of fitness and speed have improved, and there may be a more favourable approach towards certain types of players improving in 1 area while regressing in others.
There are certainly more long range goals, and that is in part down to the balls used and the perfect conditions.