When you reach 10th level, you achieve a profound understanding of how to use and make magic items: You can attune to up to four magic items at once. If you craft a magic item with a rarity of common or uncommon, it takes you a quarter of the normal time, and it costs you half ...
Granted, but in this example, we can just assume I have Prof in Smith Tools. And of course, with needing the item, which is why (using Xanathar), it is 2 work weeks to make an Uncommon magical item. But as I said, if I can make an Uncommon Breastplate of whatever, then I should...