Thats exactly the guys point yet E
Ole was finally getting a decent side together, Ronaldo was a disaster for that side, which with Carvani leading the line would have been a decent side, not title winners but a step in the right direction, as for 3 major signings a year I remember Jose ranting at the cameras in the summer of 2018 a season after he finished 2nd in the league and 1 season after winning both the UEFA Cup and the League Cup that he was allowed to bring in just Fred and 18 year old Dalot, when he was desperate to strengthen midfield following the retirement of Carrick and sale of Fellaini and Daley Blind.
As for Potter he was a huge success at Chelsea wasn't he.
ETH is the right man at the right time, he is already investing in the academy, Hojlund will be a great striker, Mainoo is the future, Martinez is a giant, Amad, Hannibal, Pellestri, but the position he started from was so low it was never going to be fixed in one or 2 season, ETH has already embarked on the development of his own Class of 92, I for one hope the Glazers, INEOS or whoever owns the club in the coming years have the guts to stick the course.