#3 Other top clubs aren't standing still
The top clubs and genuine title contenders in the Premier League nowadays do not only spend a lot of money on high-quality players but also keep refreshing their squad every season so as to stand a better chance of having a crack at the title.
The only exception is perhaps Tottenham Hotspur, who have built a superb squad on a budget and in Mauricio Pochettino, they have a manager who had consistently proven to be one of the best young tactical minds in Europe at the moment.
In addition to that, the presence of some of the best coaches in Europe like Pep Guardiola, Jose Mourinho, Antonio Conte and Jurgen Klopp has also made the Premier League a far more tactically evolved league. In this sort of an environment, it is highly unlikely to see Arsenal, with their cavalier approach to preparation and tactics, challenging these club for the Premier League trophy anytime soon.