Since copper slabs and stairs are still expensive after the change, mojang should give the stonecutter the ability to be able to be upgraded to cut copper blocks. The crafting recipe should be 5-8 gold ingots with a stonecutter.
A copper stone cutter could be used for carpentry- that is, cutting wood blocks. This would be a great deal more helpful, (At least in my opinion), considering how irritating wood stairs are to make, and would make sense for the softer metal type. ...Also, on something of an unrelated side note, I've always found it a bit silly that sweet berries damage a player... but standing on the stonecutter saw doesn't. It would be neat if you could use stonecutter saws as traps to some extent.
Copper is softer than iron, which is what the stonecutter's saw is made of. It wouldn't need any additional upgrades to be able to cut copper blocks, I reckon.
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Totalitarian architecture. Angular, defensible masonry over sleek, sloped carpentry.
Taking it slow. Provoking into attack typically does better rushing.
Underground engineering. Well-lit tunnels are much safer and often cheaper than any surface construct.
Farmability. One of primary concerns relating to any feature.
Practical mobs. No annoyances taking up space and processor power.
Generalism and simplicity. Overly complicated and specialized concepts hardly ever come into fruition.