Perhaps patience was never what they had in common with Manchester United because in Manchester United even if they just signed a coached now and they played 10 matches without wining they will never have the thought of sacking the coach because they would always think of giving him the whole season to see whether he can change so perhaps that's why when they fall it takes many seasons to come back because of the extent at which there fall had gotten to but Bayern Leverkusen on the other hand doesn't want to get too bad before they can start seeing the coach faults.
It is true that Manchester United always gives its coaches enough time, but I disagree with you if Manchester United's new coach fails to win 10 matches in a row, Manchester United won't sack the coach because that era is gone. If Ruben Amorim fails to win more matches for Manchester United when the international break is over, he will be at a big risk of losing his job at Manchester United.
If not that new players are now in there mins you would have seen that Ruben Amorim will lose even more than 10 matches and nothing is going to happen to him at that moment, I don't see any new era in Manchester United you are saying because they are just the same in terms of decision making as when ten hag was still there, however if you think they're not in that era again, what changed about them?, although is difficult to see Ruben Amorim with a lot of matches without wining because it cannot happen no matter how ineffective he could be. Leverkusen is already having the season they never want to see from there performance and this could progress till the end of the season.
I would have love to see Reuben Amorim struggle to win matches at Manchester United so that you will see what I am talking about, but I won't wish Ruben Amorim that because I want the glory days to return to Manchester United so that they can challenge for the premier League title and champions league trophy. The fact that Bayer Leverkusen management sold their best players to other clubs, they will continue to struggle this season even with a new coach.