Now it's never been easy for teams to be stayed for long time in Premier League after having promotion because it needs good strategy with good funds which helps them for having good players into their squads game is almost change consistency and quality needs money.
I agree with you, football teams that get promoted to the 1st division Should have a sufficient budget to sign high level players and coaches, in fact in the PL we realized that Whoever pushes from the middle of the season and gets a good score has a good chance of winning the PL , more so in this season where City went down like a ravine, now things are getting better, what I like about the PL is the Physical level of demand, it's the best.