OK, this is a very specific point to comment on, but - I'd disagree with you about the computer cables.
I occasionally get annoyed by my Big Box Of Cables: I used to work in digital filmmaking, so I've really got a LOT of cables in there. And it's a pain to have to wrap 'em, store 'em, and periodically cull 'em (I think I can safely chuck out the SVideo cables now...).
But whenever I need a cable whilst working, I can check that box, and after a bit of digging, it's usually in there. 5 minutes lost max.
If I don't have a cable in that box, I either have to go out to buy one - total time loss between 25 min and 2 hours depending on whether I need to journey to Maplin or can just get it locally - or buy from Amazon, which could be a day lost if the task I need the cable for is on the critical path for whatever I'm doing.
Local storage is sometimes more efficient.
(Having said that, I did make one change a while back. Unless I'm really, really sure I will need more, I only ever keep 2 of a specific cable type. At one point the spare cat-5 was threatening to take over the house.)