What are the limitations of ARPA?

As a keen observer of the financial and cryptocurrency landscape, I'm curious to understand the limitations of ARPA. Specifically, I'd like to delve into the constraints that might hinder its widespread adoption and impact. Are there any scalability issues that ARPA faces? Does it struggle with interoperability with other blockchain networks? What about regulatory hurdles and compliance concerns? Understanding these limitations will help us better evaluate the potential of ARPA and its place in the broader cryptocurrency ecosystem.