Some of the fans are concluding based on emotions, which is very wrong because emotions can never lead you to say the truth. But truth be told, Manchester United is too big for Ten Hag, which is why he is not able to put things in place to bring the best result for Manchester United; some fans were able to understand, while others are still arguing blindly that he is a good coach that will bring victory back to Old Trafford.
Ten Hag actually tried last season to win a trophy for United, but his thinking ability as a coach is not world-class thinking because, from his way of substitution, he is not proving himself as world-class coach due to some errors he does make, which he usually refers to as tactics whenever he is doing his post-match conference. Manchester United need to sack Ten Hag for them to become the world-class team they used to be.
I don't think you're right when you said the team is too big for Erik Ten Hag, cause same person managed them last season, qualified for the UCL, won the Caraboa Cup, played the FA Cup final, so if the club was big for him like you claimed do you think the club would had gone that far under him, we've not even talked about the good record he had at Old Trafford last season, Erik Ten Hag might have been wrong with his choices of decision several times this season but the problem is not generally from him and fans should learn to understand that.
I think he's really affected by the general crisis affecting the club, from the injury crisis to sale process, to the issues with Sancho and several other players, what he needs is time to get them to start doing better and I believe they'll bounce back sooner or later, sacking Ten Hag might not change anything if the Glaziers are still in charge of handling the sporting activities of the club.