> In that: if it fails, it is only considered evidence that you were not doing it enough.

Seen this multiple times

The problem is agile as in the original manifesto was an ethos, not a process.

Everything since the manifesto, called agile, has tried to wrap an ethos up as a process, playing lip service forgetting the ethos.

High performing teams are already doing agile, following the ethos without attempting to be agile. High performing teams made to do agile become average teams and low performing teams made to do agile can become average teams.