Why does zashi re-use the same receiving t-address?

On a separate note regarding the repeated use of t-addresses, I’m wondering what is the difference of withdrawing directly from a CEX to 1 t-address and shielding versus 10 t-addresses and shielding? Does the action of shielding from 10 unlinkable t-addresses increase the effective size of the anonymity set since it’s potentially 10 different users versus 1 user? Or, over a long period of time and lots of noise and activity happening in the orchard pool does this matter that much?