You can swap with atomic swaps and you just pay mining fees and retain custody, and you don't need your resources to be on XMR, it is fungible money, as soon as you receive you can spend it and have the resources you need paid by interchangeable money. No traces and no identity, just usable digital cash.
Discussion
Atomic swap requires more movement onchain than a single tx, and so more fees, and most coordinators take theirs fees for maintaining up the service.