When I see words like nestable and infinite, I assumed this would be something where you can draw a diagram and then zoom in or out to see it at different detail levels. IE, draw a CPU diagram and zoom out and it becomes a simple box. Then you construct a motherboard around it. So I can see it as a simple block diagram at motherboard level, but as I zoom in the motherboard disappears and I am in the context of the CPU, seeing things like cache locations, cores, etc.
This is a product I REALLY want. Since I want to be able to diagram entire complex systems without always seeing 10,000 boxes on screen. You could start a presentation at 35,000 feet, showing the entire rough structure, then zoom into different regions where more detail will appear (infinitely)
Nestable feels more like excalidraw, with a folder/file structure?
I've been working on something that might be worth giving a try! [1]
It's built more for specifically for software architecture rather than general whiteboarding, but we just recently added custom icon uploads so you could add whatever icons you want if you're more interested in hardware. The 'logical component' operates in two modes, one which is just a group, and one where it acts like a sub-board that scales its contents to fit the box.
All their branding does this now, including the HashiCorp logo on their website [0]. There's gotta be a name for this specific branding pattern, but I don't know it.
[0] https://www.hashicorp.com/en/blog/products/terraform