From SEGW and Legacy UI5 to RAP with ARC-1

Series note: This post is part of my AI ABAP development series, where I go from AI development in general, to ABAP-specific problems, and then to ARC-1. In the last posts I introduced ARC-1, explained why I built it, showed the BTP architecture, and then used it from Copilot Studio and Joule Studio. Those posts were mostly about architecture and possible use cases. This one is different. This is the use case ARC-1 was originally built for: making real SAP development easier. A lot of SAP customers are still somewhere between old ECC-style custom development and the S/4HANA world they actually want to reach. The uncomfortable part is that “moving to S/4” can easily become a technical lift and shift. The old custom code moves, the old OData services move, the old UI patterns move, and after the migration the landscape is still not really modern. It just runs somewhere newer. That is not the direction I find interesting. If we already touch those applications, then we should also ask…