But in the PL, the margins are so small.
Both City and Chelsea have the same financial capabilites as you have, and have been using them to the fullest. Liverpool and Arsenal are not far behind. The teams are all stacked with quality. And apart from Arsenal, they're all managed exceptionally well at the moment.
And then, it's very hard to improve to the point where you can actually beat out those competitors, and finally beat out Pep's City to a title: it took all of the "mentality monster"-dom that Klopp could get his team to muster up, to do it for one single season. And there just isn't a tree where Klopps or Guardiolas grow, there really is just the two of them.
Even last season's CL exit, yes it was poor as it hinged on a horrible, inexcusable loss to that weak Istanbul side, but then again it was a bit of a tricky group, and if that exit had been down to two losses against PSG, for example, it wouldn't have seemed to poor.
This season, of course, a group stage exit would be absolutely laughably bad and surely grounds for a sacking - but then, all that happened so far is one surprise loss, there are still 5 games to play and we can't seriously be talking like you are about to go out of the group, are we? You should cross that bridge if you ever get there, which I absolutely doubt you will.