Make sure people shouldn't ask to sack Amorim when he didn't bring good results during his first season. It requires process and consistency, like Pochettino need a year to transform Chelsea.
Don't expect to much for Manchester United in this season, as long as they're not relegated, they're fine.
The management in the Premier League is different and they demand that the coach must be able to change the club to be better in a short time and maybe if you pay attention to the previous club owner, they won't give the coach time to change the team in the long term.
It's very common in today's football not just in the English premier league, expectations are high and the level football is going now, it's more of business and money, so in as much as a coach is being employed to get the job done and he definitely needs to to implement his playing system, but he can't afford to be losing too much games, because at the end of the day, no matter how sweet your playing pattern is, if you aren't winning games it wouldn't make sense to the fan and to the hierarchies alike, so getting the desired result is very much important even though you are building a team for the future.
Then talking about Amorin, he is actually a promising young coach which i believe that he has a very bright future in the coaching business, but this Manchester united job that he took is definitely going to be the most challenging job he has ever accepted no doubt, because winning is very much important in today football, regardless of if you are building a team or not.