Agreed with the points in that article, but IMHO the no 1 issue is that agents only see a fraction of the code repository. They don't know whether there is a helper function they could use, so they re-implement it. When contributing to UIs, they can't check the whole UI to identify common design patterns, so they re-invent it.
The most important task for the human using the agent is to provide the right context. "Look at this file for helper functions", "do it like that implementation", "read this doc to understand how to do it"... you can get very far with agents when you provide them with the right context.
(BTW another issue is that they have problems navigating the directory structure in a large mono repo. When the agents needs to run commands like 'npm test' in a sub-directory, they almost never get it right the first time)
The most important task for the human using the agent is to provide the right context. "Look at this file for helper functions", "do it like that implementation", "read this doc to understand how to do it"... you can get very far with agents when you provide them with the right context.
(BTW another issue is that they have problems navigating the directory structure in a large mono repo. When the agents needs to run commands like 'npm test' in a sub-directory, they almost never get it right the first time)