because it's not bullshit that's why
He is a really flawed quality player who lacks the physique/mobility (cant correct his mistakes with speed/power) and the natural focus to be an excellent man defender, just a decent one at best, average at worst. But he has had a top career because of his overall qualities, technique, passing, ability to read sitautions and working in tandem with a stopper, that cohesive understanding and working excellent within a unit that minimizes his flaws, this adaptability has made his career.
He is not a natural 1 on 1 defender (nor a good defensive header) This is clear. There are several who arent in his type of playstyle, difference is they have more mobility then him to correct it more. We litterally have watched his entire career, in our shirt, we know his best and worst qualities. He has been a top player for most of it despite it all. Its end of his career, is declining, but even if he wasnt he allways has had couple of these mistakes in him, it comes with the territory. More in counters against speedy or powerful Zapata type attackers (is NOT a player for highlines if he is exposed, gets destroyed), he does better defending in packed defense. Wether its 3 man ideally or 4 man too.
Its absolutely utter bullshit, instead of just acknowledning the good with the bad, what you see is what you get, you go to extreme hyperbole like Boumsong or other very short lived and really bad/poor defenders we used to have (Andrade was injured his entire stay with us, random to namedrop him), would be better choices then him. That deserve a big STFU if you are serious (especially since at 33, he has had an excellent season except for these latest mistakes), because Bonucci has 10 years and 400 games in our shirt that proves otherwise. No one lasts that long by being a Boumsong, just stop.