I agree with you. While I do not necessarily think that the syntax feels overly complex (it's just YAML) the entire blueprint tends to get hard to read and complex if you add a dozen elements and tabs.

IMHO blueprints are great for a few simple cases, but anything beyond that requires writing a plugin. And plugins are easy to create and integrate in the Admin panel.

And also the Admin panel can be made client-proof. Panels like Configurations/Themes/Plugins can be easily disabled for individual users.

Now, the hardest part would be the "Pages" section which gives too much control to the client and therefore the ability to mess up the structure of the site. This is something I am currently thinking about solving with another plugin which would allow the client to modify content, without modifying the structure of the pages.

But in general I think that the way grav handles media, assets and routing is awesome and I really enjoy working with it.

Kudos to the grav team :).

you are totally right and yes, media handling is beautiful :)