Given modern tech, Nole would eat his liver for lunch. Players like Nole made players like Krajicek extinct.
This whole 'fast grass' thing is so overblown. The old Wimby grass had 30% red fescue, same as Easbourne has today, and significantly less than what Queen's has. Yes, the tennis at the grass warm-up tournaments is still a little bit different from the tennis at Wimbledon these days, but it's not like 90s tennis dominates those tournaments and the best baseliners can't dominate on such grass when they show up (see e.g. Murray at Queen's). Modern strings and modern baselining makes 90s tennis against someone like Novak a losing proposition no matter the composition of the grass.