I'd actually say the opposite. This year we have Doncic, last year we had Mitchell, In 2017 we had Ben Simmons (even though he didn't play that year, he was still drafted then). Before that it was Towns in 2016. That's 4 years in a row of having 85-89 guys as rookies.
If you want to go back farther, you had Lillard in 2013 and Kyrie in 2012 who could've arguably been 85-89. Then Blake in 2011 who was MVP caliber in his rookie season and Tyreke Evans in 2010 who is one of the few rookies to ever average 20+ PPG. I'd be willing to bet money that Zion or RJ Barrett could end up in that 85-89 range as rookies next season.
For me, the key is their potentials. I think it's fine to have 85-89 guys as long as they don't all have crazy high potentials. Looking at just the guys that I listed there, Kyrie, Blake Griffin, Tyreke Evans and KAT have all improved since their rookie seasons, but not tremendously. Especially with Tyreke Evans and Blake Griffin who pretty much peaked during their first year in the league.