TC is made for privacy, which either is or should be a basic right.
Without tools such as TC if I send you money, show you some POAPs[1] I own, or otherwise interact in any way with my crypto, it is fairly simple to deduce or make educated guesses of how much crypto I own, who I send it to or from, and more. This has serious implications not only for privacy, but for safety reasons too.
TC makes it so you can transfer from your cold wallet to your hot wallet, without trivially revealing what your cold wallet is (and thus your funds).
Furthermore TC also allows you to keep a receipt of these anonymous transfers, so you can in the future prove the origin of your funds or reveal such transactions.