The best thing about side project is that I may be wonderfully inefficient, so I can do it the way I want and enjoy the way. Even mentioning the word 'deadline

The best thing about side project is that I may be wonderfully inefficient, so I can do it the way I want and enjoy the way. Even mentioning the word 'deadline' or 'planing' or 'efficient' or 'customer' in the same sentence as 'side project' is contradictory to me. E.g., I love to program in assembler. Preferably 8 bit SoCs like AVR. The point is not to finish the project fast or even at all by using a more efficient language that may have libraries for everything, but to enjoy programming in 8 bit assembler. Reading the absurdly detailed manuals. Comparing chips at register level. Obviously, I need to write my own libraries/frameworks, because, I want to do that myself, in assembler. Even if not using assembly, I may still want to write the library myself in order to, well, do that. Wood workers often seem to have similar ideas about side projects, like when they build a project without power tools, without glue, from old scrap wood, etc., just because. But for some reason, I seldom meet hackers who understand the fun in doing stuff from scratch.