You’re gonna end up with more mid major charity cases just because you have to fill out the bottom of the large pool. And you will drive down the already not that high quality of the last power conference teams who get in.
You are using "charity" in a unique way.
If you have a 64, 68, 76, or 80 team tournament then the non-charity way to fill it out is to take the best (however you determine best) 64, 68, 76, or 80 teams.
Charity is taking teams that are clearly outside of the best 64, 68, 76, or 80 teams.
The charity in the NCAAT isn't taking power conference bubble teams. Those teams are ALL in the top 64. The charity is taking the champions of the MEAC, SWAC, Patriot, and America East. Those teams are all NOT in the top 64.
FWIW: Charity is also taking emotional feel good mid majors that almost went undefeated.
I'm all for ending charity and just taking the best 64. Actually, if we ended the charity I'd be fine with taking the top 32.