I'm in favor of making it possible to add a one-drive pool. However, it should be a solution suitable for multiple user groups.
Users like @theking8713 know what they're doing and should have the option to create a pool with a single disk and disable warnings.
Less experienced users, on the other hand, should be made aware of the risks of a one-disk pool. Creating such a pool shouldn't be too easy either, as the risk of data loss is significantly higher compared to multi-disk pools.