I do think the surface plays "firmer" now watching from tv...
Probably, yes. There was a lot of talk about bad bounces on 'old' grass - and coming to net a lot was perhaps a defence against having to cope with that as well as a direct offensive against the opponent
and also yes wimbledon is long rallies now but thats because serve & volleyers dont even exist anymore. ...
The big question is why?
would someone like djokovic or nadal win wimbledon on "fast grass"? my opinion is yes as long as they're playing the same kind of opponents they are now...
And with the same equipment.
With the strings they have now, the players can -
- a) generate much more power from the baseline
- b) maintain control of the shot while doing so
This makes it much easier (relative to yesteryears) to pass a guy at net
If todays lot, with todays equipment, played on 'old grass'? - I think your right, Nadal/Djokovic would still win Wimbledons and most players still wouldn't come to net
If todays lot, with yesteryears equipment, played on 'old grass'? - that's a tougher equation... I think Nadal/Djokovic et al would find it much harder to pass the likes of Becker, Edberg, Sampras, Rafter, Henman etc... I think they'd change their game completely and be forced to come net more themselves
In summary, I believe
raquet changes > surface changes, in accounting for the differences we see in the styles that are suited to grass between now and the past
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On video, you can see how it was becoming harder and harder to hold the net even before serve-volleying became all but obsolete.
Stefan Edberg in particular, but also Boris Becker, played from much closer to the net than did Pete Sampras. Further back still, McEnroe seemed to all but be hugging the net - even the 90s lot wouldn't have had time to handle the pace of the passing shot from that close