I know this is a little hard to read and it is just another way of showing what has been posted in other ways but what I did is look for each team's starting 5-man line up.  I got this by setting minimums for GP and Minutes, then sorted by Net Rating.  Each of these represent what I understand to be the starters (based on quick spot checking).  For some teams, like PHI, it is off as it does not include Harden so it may be the starters prior to recent trades.  Other team like the LAL and BKN are not showing up because their starters have been injured so much and there is not a single line up that meets the criteria that I set.  Widening the filters then catches a whole bunch of non-starting line ups for other teams.
For most of the teams at the top of the list, BOS, MIN, MIL and so on, the 5-man line up is the current expected starters.  PHX for example is a line up of their starters (Paul, Booker, Bridges, Crowder, Ayton) but surprisingly, their Net Rating is not that good.  I am not sure exactly what this tells us but for our starting line up to be on the top of this list is a good thing.  This is a sizable sample size.  Due to trades and injuries, some top teams like PHI, BKN, and maybe LAL are not represented but you can still read a fair amount from this.
        GP   MIN   NETRTG
BOS   27   343   25.3
MIN   27   337   16.5
MIL   29   292    14.1
NOP   22   345   12.8
DEN   30   556   10.9
MIA   24   339   10.4
GSW   29   347   8.2
UTA   37   589    7.3
PHX   32   625    6.6
SAS   25   308    5.4
TOR   18   299   -0.3
ORL   31   370   -0.4
CHA   30   372   -2.3
HOU   24   291   -3.8
WAS   26   319   -5.4
PHI   21   256   -10.6
NYK   24   428   -13.8
DET   20   254   -18.1
OKC   25   254   -18.2
Here's some perspective on how dominant the starting lineup is: lineup data goes back to the 2007-2008 season.  The starters have the best net rating of any lineup with at least 300 minutes since they've tracked this.  Best ever.
Can you post the top 10 or 20 of these line ups or just the team and the year or something?  I am curious if they are recognizable, title contenting types or more just statistical anomalies.  How much does this historically correlate with success?
I'll post the top one each year.
2008 - Celtics starters (won title) - 19.4
2009 - Cleveland -- Lebron, Ben Wallce, Z, Delonte, Mo Williams (#1 seed, conference finals) - 19.4
2010 - Mavs -- Dirk, Kidd, Marion, JET, Dampier (#2 seed, 1st round loss, won title following season swapping Dampier for Chandler) - 18.5
2011 - Celtics starters with Big Baby (#3 seed, 2nd round loss after Wade maimed Rondo) - 18.5
2012 - Suns -- Nash, Grant Hill, Frye, Gortat, Dudley (33-33, missed playoffs) -14.5
2013 - Heat Big 3 with Chalmers and Battier (won title) - 19.2
2014 - Warriors Big 3 + Iggy and Bogut (51-31, 6th seed, dynasty started the following season) - 15.5
2015 - Warriors with Barnes instead of Iggy (won title) - 20.6
2016 - OKC with KD, Russ, Ibaka, Adams, and Roberson (3rd place, conference finals, lost to 73-9 Warriors in 7) - 17.8
2017 - Warriors big 4 with Zaza (won title) - 23.2
2018 - Philly with Embiid, Simmons, Redick, Covington, and Saric (3rd place, lost to C's in 2nd round) - 20.5
2019 - Warriors Big 4 plus Looney (Finals, lost to Toronto after KD and Klay both went down) -- 17.2
2020 - Bucks with Giannis, Middleton, Lopez, Bledsoe, and Matthews (1st place, lost in 2nd round in bubble) - 18.9
2021 - Jazz with Gobert, Conley, Niang, Clarkson, and Ingles (1st place, but oddly Donovan Mitchell is not in this lineup, lost in 2nd round) - 15.0
So in 14 seasons, the best lineup had 4 titles, 1 finals, 2 conference finals.  So that's half the teams with deep playoff runs including titles.  A majority of the teams were the #1 seed.  The two teams with 1st round exits replaced one player in the group and went onto the title the following season.  The only truly mediocre team was the 2011-2012 Suns, in a lockout-shortened year.  They also had the lowest net rating of this group of season leaders, and in many years wouldn't have even finished 2nd (so they are an outlier both in results and in quality).
I'm not sure where this lineup will ultimately end up (it's played only 343 minutes and most of the lineups on this list exceeded 500 minutes together, so they might see a little regression as the sample-size grows), but it will very likely be the best in the league this year with at least 300 minutes. and those teams are some of the best of the recent decade.