I don't have any anti-big bias, tbh.

I just realize that in today's NBA they aren't as valuable as they used to be. Case in point: Anthony Davis. A freak of nature like him would be able to do better than one playoffs series win in 7 years in "yesterday's NBA", no matter how ty the cast around him is.
"As usual"

for their careers those same metrics you talk about favour Kawhi.
History isn't long enough yet to compare longevity of bigmen vs perimeter players in today's NBA.
In 2017 Leonard was definitely in the best player in the World discussion, that's why Pop actually said he was.