Ten hag has often said he likes having an impact sub on the bench to be able to come in and change the game. Garnacho is literally 18, you can't expect a manager to start an 18 year old every game. Rashford is better from the left.
I agree that Ten Hag has used Weghorst too much, but it isn't unreasonable as to why he used him so much. Garnacho is 18 and is now injured. He was a good impact sub, and was used very well by Ten Hag. If you're trying to claim he has been under-used then you're just plain wrong... Sancho was absent/injured. When he's been fit, he has been underwhelming to say the least. I feel he should play more, but also, not like he lights it up when he is there. Basically.... we've had at best 1 option off the bench for the front 4 positions who could've started ahead of Weghorst. That's it. That's why he's played so much. He's been picked by default because he's been fit, and he's worked hard and provided some hold up play.
We've played 20 games since Weghorst came. We have 13 wins, 4 draws, 3 losses from that period in all competitions, including a cup win, and progress through the other 2 cups, while scoring 2 goals per game. Yeah, we'd all rather not see Weghorst out there, but it hasn't exactly failed that badly considering we've been pretty successful since he's joined.