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> > But gschem can do schematic capture for ASIC even though that’s not its target. The difference is that gschem doesn’t limit what you can draw. It’s quirky and limits *how* you can express what you need, but I’ve never found it incapable of expressing a circuit. It gives you a few crude primitives and a few ways to compose more complex objects from simple objects. A few layers of that, and you have a 6000 component mixed-signal ASIC.
> >
> > Pcb says to the user “my way or the highway”. Gschem says “live with my quirks, and I’ll help you do anything”.
> 
> Not true, I've just gone through the entire format carefully and pcb
> actually has very little per-part or per-feature overhead.  It's about
> as close to a paint program as it can be.  It can do lots of stuff,
> though admittedly often in quirky ways, just like gschem.  Your major
> gripe seems to be that you can't "draw" 3D or inter-layer features,
> because their implementation is bolted onto the fundamentally layer
> oriented design in a hard-wired way.  It's a true complaint but not
> very useful, because adding 3D CAD would require a total rewrite with
> buckets of additional complexity.
> 
> It's completely possible to go on adding features like blind vias
> without a total rewrite.
> 
> Britton

Did you look at element/footprint file format also? Is it possible to have vias in a footprint? Put the drawing primitives in a footprint at copper or solder mask layer?

In such case the only large thing missing is possibility to reference externally defined pins/pads from within a footprint.

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