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It's unnecessary complexity for the user. As opposed to simply having the build instructions as `Run bin/build` you're suggesting "Run bin/build <project root>". But there's zero reason for requiring the user to supply the project root when we already know it.

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This is exactly the kind of implicit coupling that makes software unmaintainable in the long run. You _are not passing the project root_, you are passing the value of a variable which currently should be set to the project root. The constraints on this value are not that it must be the project root, they are other constraints that are satisfied by the project root right now.

You said earlier that "If the inconvenience of arguments troubles you, write a wrapper". That's precisely what a script like this is. A wrapper. I can run one simple, static command, similar to just about any build tool e.g. `cd project && make`.

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