I have a bit of a split response to this. On one hand, I have a workshop which is absolutely packed with tools, machines, materials and so on. I can make and repair almost anything in there. Many people would look in the workshop and assume I am a hoarder.
But as far as my living space, I love a clean, uncluttered place. I will get rid of kitchen gadgets, books, disks, furniture, clothes, etc if it is not adding something useful or beautiful to my life. I have half a dozen matching t-shirts same for underwear and socks. I will regularly go through out kitchen cupboards and take things we can't/don't use to other people or food bank etc. I am a frequent visitor of the "tip shop" near where I live and things get repurposed and rehomed there. I love a clean streamlined life, I would be more streamlined if the people I live with were more into that mindset ๐
I believe 18V and 20V lithium batteries are two ways of talking about the same thing (5 lithium cells in series, making up the battery). One refers to the nominal voltage of the pack, and the other refers to the maximum voltage of the pack. I think certain manufacturers (DeWalt, and possibly others) started using the max voltage as a marketing tactic.