Watching only goals conceded is far from enough. Had you watched full matches this season, you would see the countless times the opponent freely ran in front of our box. No one was pressing him because all was pushed too high upfront. Ofc when we keep giving them gifts, 1 of 10 times our defenders would make mistakes. That's unavoidable.
Count the times Skriniar won a 1-vs-1 due to his individual brilliance too. Well, in Conte time it almost never happened. There was always at least another to cover, or at least, limited the space he had to handle.
If the best trio in the league, if not the world, were running like headless chickens, you know players aren't the problem. But the tactics.