Agile is just a fad. Don't adopt agile because the world is. Adopt agile if it solves your problem. For which you need to know your real problems.
When you are new follow them as-is. But don't stay new too long.
Question everything. See beyond methodologies and manifestos. These are not perfect. There is scope of improvement in them too. Challenge them. Seek beyond and deeper.
Best of luck!