Rafa came a bit before his actual peak (2008), Federer stayed a bit after Nole's actual peak ended (2016), whatever happened in between is the strong era 08-16. This inflation after 16 and some inflation before 08 is balanced, you will never accept it but Federer would never have won all those slams if there was someone as great as him aged same or just a few months older/younger than him was present while he was growing up, dude look at the players from 1972 to1986, most of them are injured or moody people, except Roger all of them quickly ended their careers, you might say these are technically better than the Zverevs/Raos/Thiems/Kyrgios/Medvedevs but those players grew up pre internet and these men of the so called CIE are in the smartphones era, thus the skill gap maybe but it evens out on the whole. Safin was a party animal, Hewitt was tiny and not suited for the grind of the baseline era, Roddick was not that talented as Roger, Dave Nalby had fitness issues, Blake, Davydeko, Gonzo etc etc were again not that great, Kuerten was already injured and finished by 2004, Pete was retired, Andre running on fumes, Philippoussis & Henman again not great players to pose challenge and their style of play got outdated too..... then the 5-6 years age gap ensured that Nadal was yet to mature on HCs to be a slam contender, Nole and Murray were little babies, Nadal you say was in prime on grass in 06 but we know he reached the final due to a weak field, it was 07 when he reached is prime & peak both at the same time, thus the "vacuum" which former greats like Wilander, Kuerten described is here to see. These players might be better than 90s gen but not by a big margin, the Big 3 would maul them alll anyway and that is what hapened, Roger did it before 07-08 and Nole-Rafa are doing it in the 16-22 phase, by the way why do you use 16-22 ? You should use 19-22 maybe, 17 & 18 was exploited by Roger himself who won 3 slams and rose to 1 in this period. The vacuum is only 21-22 if you ask me, till 2020 FO most of the slams had good tennis. 2020 USO & 22 + 22 years can be said to be bad, before that it is pretty awesome whether you accept it or not.