Manchester United and Chelsea are both not in good situations but awe can't say Manchester United should get Eric Ten Hag fired because Chelsea didn't do the same thing with Potter in the last season when he got bad results in Chelsea because Ten Hag is the coach he had good performance in the last season and he saved Manchester United from the bad situation they had that's why I think Ten Hag should stay in Manchester United and they should give this coach more time. Regardless of that, I think the performance of Manchester United during the summer was very bad and that's why this team had a bad start this season.
This season, Manchester United performed better than Chelsea, but if you measure it with their performance last season, Manchester United certainly experienced a slight decline in their performance. I agree with you that Erik Ten Hag should not be fired early because the work done by Erik Ten Hag so far is still quite good because it has succeeded in bringing Manchester United back close to the top 4. Manchester United players at the start of season were also hit by a storm of injuries which hampered their game development a bit.
The busy schedule and many injured players mean that Manchester United sometimes doesn't perform better and Manchester United management must think carefully about this in order to improve again in the January transfer window. Manchester United needs to bring in lots of players to strengthen their defense sector and also strengthen their front line.