I reached for the up button about five times reading this. I absolutely 100% agree. Agile, and all of it's little branches, were created by self managing teams. Each team did it differently so named what they were doing differently, we got XP, scrum, kanban, etc. Spoiler alert: it wasn't the specific flavour that led to success, it was the diverse, empowered, self managing team of mature, talented people. Get yourself a team like that and the rest will care of itself.