I know I'm beating my own personal dead horse but teams under-.500 do not belong in the post season, and they especially don't when teams above .500 are being left out.
I couldn't agree more.
In baseball, I hate the wildcard additions. I liked it better when only the division winners got in. They play 162 which really separates the good from the mediocre and the bad. But then they now allow the mediocre and sometimes bad in and those teams often upset superior teams due to short series and disruption of every day rhythm with so much time off in between.
Same happened in NASCAR when they went to the playoff format. Instead of one driver running away with it 2/3rd though the season they reset the field. To me, that's like saying "well, this football game is 35-7 after Q3 and we're going to lose our audience so we'll reset and start Q4 off with a score of 21-10 to keep people interest throughout". The when the team down 21-10 pulls off a couple of big plays to come back to win 24-21, they celebrate like they actually were the better team.
I HATE that!
WRT the NBA, they play half of the games that MLB does and that often involves back-to-backs which makes the regular season a bit less reliable and more enigmatic. So I'm ok with a larger field of postseason participants. And to your point, I don't think anyone under .500 should get in. Even 41-41 is suspect.
And to your last point, I've always had a problem with teams getting squeezed out because they happen to be in a super competitive division or conference. That just shouldn't happen.
I recognize that travel has always played a huge factor, but in this day and age -- it shouldn't anymore. Keep the conference alignment format for the regular season to keep travel at a minimum, but when it comes to postseason -- take the top 16 regardless of division or conference. Sure, there can be problems with that, too, as some teams might have inflated records playing in a weaker conference ... but no format will ever be perfect.
If you end up with some series being regional and some being cross country -- so be it.