I think it's more related to aversion towards reinventing the wheel. Building software takes time and it's highly unlikely that your tool will be better than something which already exists. In any case, if you're working on hobby project or you're learning, it's quite okay to build your tools. If you do something professionally or you work on the software for which you're sure will reach production, try to stick with tested methods and tools. You'll save lot of time and nerves.
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I think it's more related to aversion towards reinventing the wheel. Building software takes time and it's highly unlikely that your tool will be better than something which already exists. In any case, if you're working on hobby project or you're learning, it's quite okay to build your tools. If you do something professionally or you work on the software for which you're sure will reach production, try to stick with tested methods and tools. You'll save lot of time and nerves.