Sarri started this nonsense of moving Kante away from his best position, so its not really on Lampard.
Possibly he started it.
But it's not Sarri's fault that Kante now playing as a DM is still feeling obliged to leave the position and get involved up top while also doing the bulk of playmaking, which is what that role in Lampard system requires.
Basically half of Kante's problems are on Kante and his desire to bomb forward. He's been scoring some good goals and wants to be involved higher up the pitch. Which makes him a liability if you need organisation.
He's finished as a pure destroyer/harrasser/tackler.
Yh pretty much. As a pure DM in a 4-3-3 he can still work as you said. But having him trying to move the ball in a double pivot is just hilarious to watch. Imo Kovacic-Jorginho is the way to go.
I don't think he'd work as pure DM. He doesn't want to be one anymore. You can tell by where he chooses to go vertical. He could be a good RCM. But needs a disciplined DM next to him.
He's more like Lassana Diarra, Essien, Yaya and the like nowadays. Even Casemiro has more discipline, but is arguably worse than Kante on ball.