I was intuitively clicking on the boxes expecting to go to the details of that component. It would be nice to move deeper into sub-layers dynamically, instead of relying on the side tree menu.
Yeah I thought about this as well and is something I originally imagined as a cool feature.
The problem, though, is that not everyone will create a sub-layer for every component. It'd be a bad user experience for the viewer to have to just try clicking components to see which ones work, and I don't want to modify the look of the diagram, from what the author intended, to add some visual indicator that it's clickable.
Please do reconsider adding a visual indicator. Direct manipulation is a powerful UI technique and helps retain user focus. It could be something as simple as the mouse pointer changing when hovering over a component that can be drilled down into.
Hovering the navigation on the left could also highlight all linked components as well, giving a better sense of what you can drill into (without having to discover for yourself by moving your mouse all over the diagram).
I was intuitively clicking on the boxes expecting to go to the details of that component. It would be nice to move deeper into sub-layers dynamically, instead of relying on the side tree menu.