The concepts themselves have never been a problem, it's been the "best practices" of the concepts that have been a problem. About two decades ago, I tended to suffer from NIH (not invented here). I still seriously overthink decisions like REST vs graphQL vs RPC, which component libraries or frameworks to use, etc., as I'm still highly opinionated, but I at least understand that outsourcing the work to someone for whom the library/framework is their primary mission is more likely to produce a quality product than rolling my own in between or in support of my real tasks.
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The concepts themselves have never been a problem, it's been the "best practices" of the concepts that have been a problem. About two decades ago, I tended to suffer from NIH (not invented here). I still seriously overthink decisions like REST vs graphQL vs RPC, which component libraries or frameworks to use, etc., as I'm still highly opinionated, but I at least understand that outsourcing the work to someone for whom the library/framework is their primary mission is more likely to produce a quality product than rolling my own in between or in support of my real tasks.