This idea that you avoid creating a dependency mess by writing more of your own work, isn't the entire truth. The dependency is just internal
The point is that it's better to depend on something simple and quickly fixable than something convoluted. Vendors/sponsors can and do go away.
If you have a skilled API builder, they know how to do KISS. If a specific need requires something that's not KISS-able, such builders will be honest about it and recommend a pluggin. But every shop and domain is different such there are indeed cases where throwing libraries at the problem is the right tool for that particular job.
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The point is that it's better to depend on something simple and quickly fixable than something convoluted. Vendors/sponsors can and do go away.
If you have a skilled API builder, they know how to do KISS. If a specific need requires something that's not KISS-able, such builders will be honest about it and recommend a pluggin. But every shop and domain is different such there are indeed cases where throwing libraries at the problem is the right tool for that particular job.