... I cannot count the number of times at my different workplaces where we had an agile process, dailies and everything else of the agile BS for projects which where either trivial or not solvable. No worries, the managers, product owners and agile coaches made money and felt good, we developers went for greener pastures...
Agile is a scam, nothing they do is based on any facts and when you challenge agile coaches / other people which profit it is always 'I believe' or 'proven by anecdote'.
Combine this with the low quality of people in the average software projects and you have a receipt for failure.
Writing the requirements first at least forces people to think trough a project (even if only superficial), so I am not surprised the success rates for this projects goes up.