Did Lendl and Vilas play 1 week tournaments and never rest at all???
Are the quality of the tournaments that Lendl & Vilas compete in of high standards?
The tournaments that Federer takes part in are at least International Gold Standard, and no small tournaments. I just feel that if you reach many finals but these finals are from small tournaments, it is not an fair basis of comparision.
"International Gold" is just a recent creation. Everything in 80s was Grand Prix/WCT. Some big events, some medium, some small. Not sure how to compare, since the tour was totally different structure. Many of the tour events of the 80s don't exist anymore.
Here is Lendl's streak of '81/'82, he certainly was beating some great players on many surfaces:
Madrid (clay) def Arraya 32 draw
Barcelona (clay) def Vilas 64 draw
Basel(indoor hard) def Clerc 32
Vienna (indoor hard) def Gottfried 64
Cologne(indoor hard) def Sandy Mayer 32
Buenes Aries(clay) def Vilas 32
Masters(indoor carpet) def Gerualaitis 8-round robin
Delray Beach(clay) def McNamara 16(much bigger prize money than others, so must have been a big event)
La Quinta(outdoor hard) lost to Noah 64
Genova(indoor carpet) def Gerulaitis 32
Munich(indoor carpet) def Smid 32
Strasbourg(indoor carpet) def Mayotte 32
Frankfurt(indoor carpet) def McNamara 32
Monte Carlo(clay) lost to Vilas 32
Houston(clay) def Clerc 32
Dallas(indoor carpet) def McEnroe-this event was huge in the 80s, bigger than a masters series event today, big prize money & prestige, etc
Madrid(clay) lost to Vilas(that's crazy, going from carpet to clay within a week!) 32
Forest Hills(clay) def Dibbs 64
Lendl was 15-3 in finals during this streak, facing all top 10/20 players in finals during that span on 3 different surfaces(though Har-Tru clay is a bit different from red clay)
8 on clay
6 on carpet
3 on indoor hard
1 on outdoor hard