People absolutely build solutions to problems that are already solved, often worse than the existing solutions.
Your complaint about the phrase seems to be that it doesn't well describe the process of adjusting another design to work better for a specific use-case. But that's not what the phrase is trying to describe, it's literally describing the problem where people reinvent that which absolutely does not need to be reinvented.
Your complaint about the phrase seems to be that it doesn't well describe the process of adjusting another design to work better for a specific use-case. But that's not what the phrase is trying to describe, it's literally describing the problem where people reinvent that which absolutely does not need to be reinvented.