"Agile" (little agile) was certainly designed by developers for developers.

Your first sentence became correct after managers and MBAs co-opted the term and turned it into "AGILE" which has almost nothing to do with "agile".

Maybe we should call it !AGILE ;-)

I always thought it was for managers who have trust issues.

There were some very interesting things in the agile movement before it was snuffed by sales at consultancies.

It started out with good intentions -- it is hard to dispute that. However, it has turned into one thing -- a fraud factory. People preaching it can be waterfall without all the proper planning of it.

I feel confident I can wield Agile against bad management to protect developers with extremely high effectiveness, so in that sense I would disagree.

This is Scrum, not agile.