Avail feedback

This document provides detailed, comprehensive feedback on ALL Avail Nexus documentation, including the Introduction, Core Concepts, SDK Reference (Bridge, Transfer, Bridge & Execute), Widgets, and supporting materials. Each section includes specific recommendations for improvements that would enhance developer experience and reduce integration friction.

I build this by going through the avail nexus sdk documentation, then trying it out to see what could be improved and how would it make the developer integration much smoother. I tried using nextjs + rainbowkit and wagmi with nexus. Just simple demo apps to test out functionalities.