Yeah, if you have the luxury of long enough coding time and infinite working memory set ^[i.e. in your brain, so that you can keep all considerations of your whole project in your mind at a time], then it would be a objectively superior practice to make your project without including other libraries.

If on top of that, you also have inculcated all cumulative knowledge and mathematical insights that go into the design of an optimising compiler, then you want to be writing in Assembly, separately for each processor family.

Also, you can arguable do better with FPGAs and even better with ASICs (which will end up having a lower marginal cost than an FPGA based solution). And I might be getting ahead of myself here, but you can also draw all the layer masks yourself to get maximum control over the relative capabilities of each transistor printed on the silicon.

Sadly you can't go further than that without either requiring superpowers that would let you precisely generate UV laser beams from your fingernails/eyes/hair/whatever or going backwards in the technology progression to make transistors by hand, which would just end up with lower performing, high energy products.

P.S. Just realised that this was not in memes/humour community but keeping this nonetheless because it is fun