I'm gonna be honest here, I really don't get the point of the midseason tournament, it is just useless to me. The NBA already has an elimination tournament, its called the playoffs. Putting another mid season is not going to generate the interest the NBA thinks because winning it doesn't really mean anything, there will still be 2/3 a season to go! The playoffs matter because its the culmination of something.
The play in in for bottom seeding is fine, thats what the MLB does for its playoffs. I don't think it really matters all that much because unlike in MLB lower seeded teams never actually win it all soo the stakes really arent that high. Its a pay in to decide who gets smoked by the 1 seeds. So take it or leave it, its just kind of pointless.
And the reseeding at the conference finals is also fine too, its really just to keep the WCF from essentially being the NBA finals. As somebody who had to watch LeBron James take advantage of the east weakness for a decade its a little annoying that now that he's in the harder conference this is suddenly a consideration.