Pochettino is good, but for a team that doesn't want to fight for anything. A team that can go 4-5 seasons without winning a trophy and they'll be satisfied with just playing well and finishing in the top 6. That's not what they need at Chelsea. With the amount of money Chelsea has spent, they need results. They need to win games and compete for trophies.
In my opinion, I think Pochettino has to go. It's sad but he has to go.
We have not seen Pochettino use Nkunku yet in the league, and we know that Jackson sucks! so let us just assume that the lack of a good striker for Chelsea is what has affected his expected results for Chelsea because there has been no change in the position Chelsea were last season and then this season. I will not say that the people who are calling for his sack are asking too much, the coach has to proof himself and justify the investments that has been made into getting new players for the club. Tottenham spent less money and are having better results. If Chelsea continue like this, they will also not be in the champions league next season for failure to finish top four.