Agreed.
But then, if they look back on their careers, yes, they were a success (in a narrow sense) but rarely delivered on the promise of their abundant talent.
Above all, they won't be remembered.
I will wager that there are kids today, - small kids - who will remember this week, and next week, for the rest of their lives, and who will be able to name that Leicester team - and squad - forever. (I blush to mention that I have an embarrassing degree of almost complete recall of the Arsenal team of 1971…)
That Leicester team are now immortal, - they are legends - in Leicester, at least. Fading photographs will hang in pubs for at least half a century, grannies (Claudio Ranieri mentioned this) are sobbing with happiness, and kids are awestruck and given dreams that will last a lifetime.
In terms of career satisfaction, - and emotional dividends - this is what they - that team - will remember. Today, in the Guardian, I read a piece written by a Nottingham Forest player from the 1978 team (and this is what defined him in writing the piece, not his subsequent - and pretty successful - career).