I was watching a tv show about the invincibles era

[IUFG]

The absence of a European triumph, or indeed coming close, is often held up as a reason to knock them.

or not winning back-to-back titles

[SWv2]

or not winning back-to-back titles

Indeed, a real failure in my book.

In the past we seemed to win a title then rest on our laurels as such instead of using the success as a basis for aggressive strengthening. Of course one has to acknowledge that winning the thing is difficult enough in the first place, to retain it would merely be rubber stamping the team's dominance.