Willem-Jan, I do not disagree with most of what you say, but I will admit that I've seen Scrum misused more often than not. Agile is frequently taught in terms of simple Web apps, not complex systems where architecture and design are critical.

I believe in Agile development principles and I hope that you might find the following link worth reading.

https://medium.com/nerd-for-tech/leading-agile-development-19560bd37e8