Without a huge slice of luck/other players bailing him out - Akanji costs us both the treble and 4 in a row. I've never understood the hype around him. ANd his lack of recovery pace/desire to getback in is hugely concerning.
Again, as commented above, that's how the confirmation bias works: ignore the good things (great performances vs Bayern, Real and Arsenal, without them might have failed to win the trophies) and remember the bad things, as if the other defenders never make mistakes.