This is just massively incorrect. Trippier absolutely smashes Walker in attacking metrics and has since he started playing regularly in 16/17. Absolutely smashes him. Beats his assists, chances created, key passes. Even this "terrible" season, Trippier's smashing Walker's attacking metrics (Walker averages 0.7 key passes, Trippier 1.6:
And this is the point. Trippier (both our fb's in any game we play) are asked to play a certain way. I urge you and everyone taking part in this debate to watch the MNF analysis that Carragher did tonight. He highlighted the way Poch wants us to play, where he places our FB's and the problems it creates. It's a high risk/high reward strategy. He highlighted the fact that "yes" it was a sloppy pass from Trippier, he also highlighted earlier occasions (and there were later ones too) where we got broke on and could have punished, but the bigger issue was the gaping chasm between Vertonghen and Davies and what Vertonghen did (as well as saying Lloris was poor).
Just look at how far back Rashford is.
They highlighted that Vertonghen initially tries to read where Pogba's going pass and makes the actual pass too easy. Then they also virtual reality'd Lloris's position and he was miles too far to his left and gave Rashford too much to aim at - also pointed out that he's done this before (used Salah's goal as an example).
So let’s keep this in perspective. Trippier is a fucking long way from the only player to give a careless pass. Rose for example who has a shocking completion record and frequently gives it away when we are piled up field. Dier's the same, almost every game gives a sloppy one away that causes us problems and all our forwards/AM's do it.
I think Trippier's weaknesses are he's not the most robust defensively, can get out muscled, he hasn't got lightning pace (but few have) and he can't really dribble.
But he hasn't cost us any more goals with actual diabolical errors than many of our other players have. Most of what you and others lay at his door are mostly about the way we play and the risks we take, and we take that risk because the attacking metrics pay off.
Either way, offensively his metrics are the best for any RB in this league, and have been since he started getting regular games.