It's very true, but to get agile to work well, I found you need quality senior people at every levels. Otherwise, gateways come in place to make up for the lack of experience... and you wind back in the waterfall hell scape.

Also a lot of people have taken in agile and bastardised it. They kept the keywords and love it in business speak, but won't let a sprint run without putting their hands on everything and everyone, destroying the actual velocity of the said team. And that is I think why so many people now hate agile. We went from increased engagement and transparency to impossibility to concentrate.