I agree with your general point, Jvalin, that you can assess a player based on your eye test; if you were discussing a 76er, your argument would be received differently.
There is data to corroborate your argument that Kyrie is not a good teammate.
For the 2017-2018 season, Boston's most used lineup was excellent:
Brown-Tatum-Horford-Baynes-KYRIE (354 minutes played).
The Celtics had only two better lineups all season, actually; at least with sample sizes reasonable enough to interpret:
Brown-Tatum-Horford-Baynes-ROZIER (115 mins)
Brown-Tatum-Horford-Baynes-SMART (43 mins)
Woah. That means the Celtics' best lineups consisted of their starting 5
after swapping out Kyrie for Rozier or Smart. That's pretty powerful stuff.
Were the Celtics very good with Kyrie? Yes. He's a net negative defender, but very good scorer that offsets his defense. But that the Celtics are better with two younger, borderline-starting PGs speaks volumes about his value as a teammate.
Add the fact that Kyrie (injury-prone, very reliant on quickness) will be due somewhere ~$40 million in his mid 30s, and there is plenty of cause for concern.
Well done, Jvalin.
https://hardwoodhoudini.com/2018/11/12/boston-celtics-holiday-gift-guide/