Looks quite neat, but as other have pointed out I do not really see how this is different from traditional HDL languages such as verilog and VHDL. I say this because by looking a bit into atopile examples I only saw easy "digital" circuit stuff with GPIO and resistors, which are all things that can be implemented using FPGAs. However the most difficult things when designing advanced PCBs are EMC / EMI [1] problems with advanced subsystems such as an USB hub or analog filters. BOM generation and modular abstraction are already solved problems in industry (even though I hated every minute of working with Xilix Vivado) and tools like F4PGA [2] are slowling catching up.

If I may add my two cents, I think you should concentrate on making it possible to go beyond lumped element models (which can already be simulated using SPICE, etc) and simple abstraction (solved by VHDL & co) and focus on being able to offer advanced subsystems to less experienced PCB EDA users. Basically, to go for the Altium path, but without Altium. For example, it would be a killer feature if it were possible to import an FTDI USB chip module and a switching power supply module, and obtain a PCB that has a guarantees (up to a degree) that the two will not interfere with each other. Or say, have it automatically optimize a design to guarantee a certain SWR [3].

[1]: https://www.analog.com/media/en/training-seminars/tutorials/...

[2]: https://f4pga.org/

[3]: https://en.wikipedia.org/wiki/Standing_wave_ratio