Sorry I disagree. Why is the reality so grossly different?
Teams and players abilities fluctuate yearly. Historically, the 'big 6' manage the change in players abilities as they become either less or more effective, better than the other teams (having bigger budgets makes this easier as well).
its well acknowledged that we didn't make the most of our position at the end of that season as a club - poor signings, indecision whether to evolve or stick to winning formula etc... but I feel it shouldn't detract from the fact that during that one season, we was the best team in England.
Kante, Mahrez, Vardy, Schmeichel are all well known on the world stage and continue to perform to a high standard, ok Schmeichels wobbled a bit recently, but compare their performances over the past 3 years to the title winning Man Utd team of 2013. Barring David De Gea, I'm not sure any of those players have proven anything since then, but no-one questions whether that was lucky/fluke.
Succes comes as a result of the effectiveness of players/manager/coaches in that moment, not whether the club are usually successful or not.
Anyway, it's just an opinion. I really should be making better use of my Saturday nights!!