Ok so lets look at some stats, rather tha opinions or perceptions.
Tackles won per game this season;
James: 1.4
Salah: 0.6
Vardy: 0.5
Interceptions:
James: 0.9
Salah: 0
Vardy: 0
The reality is, that James is tackling back 2-3 times more than Vardy/Salah and is intercepting the ball infinitely more. Combined he's about 4-5 times the amount of tackles and intercepts than the above two players.
Yet nobody in their right mind would consider dropping Salah or Vardy, for their relatively (compared to James) poor defensive contribution. I would have no idea, why would would drop someone for lack of defensive contribution who does substantially more defensive work than other players with similar roles for other teams.
James's defensive contribution looks worse, because his attacking work is so good.
That is crazy though in what way do Salah and Vardy have similar roles to James. Salah and Vardy play on the shoulder of the last man and look to run in behind. Salah has scored 82 in 118 League games. Vardy won the Premier League golden boot last season. If you are going to compare them to one of our players then it has to be DCL and not James.
James is ostensibly an attacking midfield player and our wide playmaker who likes to drift in. He isn't going to run off the back of defenders or get 20+ goals a season.
The issue isn't how many tackles he makes it is what happens when he drifts in, and we lose the ball. We have no defensive shape. If you want to continue with the Liverpool or Leicester comparisons then when Salah goes through the middle Firmino drops off and their central midfield shifts to the right to close the space.
With Leicester when they lose the ball then whoever plays around Vardy the likes of Barnes, Maddison, Praet or Perez drop off so Leicester keep their shape.
DCL has to be the player who stays up and the likes of James and Richy have to drop and keep our defensive shape. Carlo prefers a man orientated press that targets the area around the player in possession when that happens James and Richy have to drop in and fill the holes.