The ability to create custom chips, and then export them to add to a breadboard or another chip would be amazing. Abstracting logic into deeper and deeper levels would make building extremely complex chips from scratch feasible, at least for me. I believe Sebastian Lague's project with 'Digital Logic Sim' shows a good example of this. https://www.youtube.com/watch?v=hEDQpqhY2MA If you see this post, please tell me what you think. Me and a friend await a feature like this eagerly, and I'm sure others are too.