[Daynil]

It's important to understand the root of the arguments for and against both "not invented here" and "invented here". Both can be considered a poor mindset because it's thinking in absolutes. Certainly, everyone can agree there is no need to "write original code" for every problem you encounter. If there are libraries behind which there are teams of strong engineers (React, Angular), who work specifically on that problem and exhaustively test and iterate on it, why would you take time and productivity away from the development of your product in order to create your own solutions?

On the other hand, if the existing libraries/solutions don't fit your use cases and you spend more time customizing them to work than you do developing your product, or the existing solutions are out of date, unsupported, or appear slapped together, it would certainly be worth working on your own solution to see if you can find a better way. Likewise, experimenting with custom reimplementation is a great way to understand the problems libraries solve in an in-depth way, as Dan suggests, and you may even end up with something better. You just need to be realistic about whether it makes sense to make it yourself or utilize what exists.

[austincheney]

I suppose the common problem is of when to apply abstraction. There are times when abstraction is necessary to prevent duplication of effort and other times when it is convenience layer. These qualities are not the same and I find people generally cannot differentiate them, even outside of programming. The crux of that problem is confusion is confusion of a person’s own level of effort versus actual effort auctioned by an artifact.