I think the reasons why Wilander is more omitted compared to Edberg/ Becker/ McEnroe (similar slams tally) are
- his game wasn't as appealing
- he had a much shorter peak
I could be wrong of course.
I'm not sure about the peak part at least. Wasn't notably shorter compared to at least Edberg. Could be the style, considering that wasn't S&V (even more so if you do it as smoothly as Edberg) quite appreciated in general at that time...?
Wilander won his 1st GS in 1982 and his last (the 3 GS season) in 1988. 7 GSs in a span of 7 years.
Edberg: 1st GS in 1985 and last in 1992. 6 GSs in a span of 8 years. Edberg did also reach one more F the next year (1993).
Titles overall: Wilander 33. Edberg 42.
Edberg did also win the Tour Finals and the Olympics while Wilander didn't.
Wilander won 3 Davis Cups, Edberg 2.
The biggest difference favoring Edberg is weeks at #1. Edberg 72 and Wilander 20.
Edberg also reached the F at each GS. On this, I was thinking Edberg may have been more an all-surface player, but what actually caught me off-guard is how little he played and won on grass. Only 5 titles, 4 being GSs (2x AO and 2x Wimbledon). 1x Queen's. Those were pretty much the grass tournaments he participated in. Instead he excelled on HC (23 of his 42 titles) and carpet (11 titles). For Wilander, of course it was clay (20 of his 33 titles). After that HC (9 titles).
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Becker's span between his 1st and last GS: 12 years. Notably longer.
McEnroe: Well... I'd regard him almost an entirely different case. You can't simply go based on his tennis prowess and results. Flamboyant, rock star esque. Legendary battles with Borg. But also that crazy 84 season.