When I've seen necks being built and asked questions, I got answers from experienced builders about material, design and construction choices. When I asked, specifically, why something was being done a certain way, I got definitive answers.
Same with pickups. There's no magic. There are specific answers and outcomes for every specific design choice. When you ask someone why they chose specific wire size and a specific wind count, there's a specific reason and desired outcome.
Just like when you ask a framing carpenter why something is framed a certain way, they have a specific answer. They do things intentionally, for specific reasons and outcomes. For every important part/element of building a bass, or anything for that matter, there's reasoning and intent.
Some people claim that knocking on a neck or body blank is part of their build process and it informs them of,....something(?)
I ask what that is and there's never an intelligible answer. It's a part of the build process that a lot of people don't bother with and they still produce top shelf instruments. It's also the only part of the build process that is this debated, subjective and open to interpretation of what it's value is.
Any other part of the build process, I can have conversations and ask questions without people getting emotional or defensive and get clear cut answers as to what, why and how. As soon as the conversion turns to people knocking on hunks of wood, throwing around words like "resonance" and people giving obscure, imagined definitions of how it all works,......it sounds a lot more like a conversation about politics or religion than it does a conversation about constructing an electric bass.