I was thinking exactly this. Example - a 3d app I worked on. There is a tool that does a set of complex modeling operations on geometry. The operation description seems simple, the attributes that control the tool are easy to understand. But underneath it there is 50k lines of code - 1k for the common case and 49k to handle all the (literal) edge cases you can have with complex real world data, which came in from dozens of customers over the course of decades, mostly highly proprietary one off models.
I think agents can absolutely write the default path correctly and it will work most of the time and seem to be feature complete. But I don't see how they will quickly handle all those dozens of edge cases.
Over time it can happen - each time a case fails, send it to an agent and have it implement the conditional case. But that will take a long time. There is a reason most solid CAD kernels are decades old - they have been battle hardened and just handle all those edge cases better than other kernels.
I think agents can absolutely write the default path correctly and it will work most of the time and seem to be feature complete. But I don't see how they will quickly handle all those dozens of edge cases.
Over time it can happen - each time a case fails, send it to an agent and have it implement the conditional case. But that will take a long time. There is a reason most solid CAD kernels are decades old - they have been battle hardened and just handle all those edge cases better than other kernels.