Sure, but even these things are not valuable unless you can actually use them to start a successful rival business within a reasonable amount of time. In other words, if there are 10 idle factories tooled to copy your product for the same price or less and your only security is "nobody else has produced the same ballpark product yet" then you are walking on thin ice (even without internal bad actors), since market demand, reverse engineering and technological change will ensure your current sales run is short-lived. This was my point. Technology businesses often need a combination of reasonable speed product evolution, good client/partner relationships, adequate capital and good name and legal standing to effect a greater sense of business security. A single rogue employee is unlikely to have all of these, and thus appeal to clients.

To look at it another way, if your perspective of evil rogue employees duplicating products was correct, how do you think https://en.wikipedia.org/wiki/YKK_Group survive? There's no crown jewels to walk away with, and there is significant anti-Japanese sentiment from the Chinese government.

Security through obscurity refers to computer security processes

Much knowledge is transferable between different types of complex systems... apologies for not appealing your terminological preference.

In SV the common wisdom is that it's fine to tell people your ideas. But nobody is suggesting you give out your code or your blueprints and designs, and put up a spreadsheet on your website of the contact info for all your suppliers and buyers, and all your customer data.