Another reason would be (self-)education. There's no better way to gain a deeper understanding of a subject or learn the ins-and-outs of optimization than writing some code and then possibly trying to improve it. If you always blindly depend on third party libraries, you will remain ignorant and dumb.
Then, you can go on and use third party libraries in production while feeling satisfied that you know what's going on inside the library.
If you always blindly depend on third party libraries, you will remain ignorant and dumb.
Depends if your goal is to become an aeronautical engineer or an assembly language hacker, really. Neither one's "better" than the other, but the the former won't benefit much from understanding exactly how to optimize on SPARC vs x64... Nor will the latter need to worry about his compiler's stalling speed :-)
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Another reason would be (self-)education. There's no better way to gain a deeper understanding of a subject or learn the ins-and-outs of optimization than writing some code and then possibly trying to improve it. If you always blindly depend on third party libraries, you will remain ignorant and dumb.
Then, you can go on and use third party libraries in production while feeling satisfied that you know what's going on inside the library.
If you always blindly depend on third party libraries, you will remain ignorant and dumb.
Depends if your goal is to become an aeronautical engineer or an assembly language hacker, really. Neither one's "better" than the other, but the the former won't benefit much from understanding exactly how to optimize on SPARC vs x64... Nor will the latter need to worry about his compiler's stalling speed :-)