Maybe because Agile is not what it should be. Managers love it Devs hate it. And every place I worked in, no one could do it right. It's not helping at all. It helps the manager to have more tools at his disposal to annoy the team, but it doesn't help the common folk. Also I'm tired to see people referring to seniors as old guys who worked as Devs for XX amount of years. Most of these people are stuck in a loop and know nothing about the new technologies and the younger generation has to teach them in the end. Also most of the senior Devs will move up in to manager positions and won't look back. None of my workplaces knew anything about SOLID principles, Design Patterns and all that fancy unicorn stuff because it looks lovely on paper but in the end it slows development down, so people avoid it. Most of the development work is done like we were monkeys with typewriters. But this is only my opinion. Take it with a pinch of salt.