Why does EMC system allow to add 2 identical accounts?

By chance, I discovered that the EMC v9 system allows users to add two identical accounts.
These two accounts can receive emails at the same time, as if they were 2 completely different accounts, but in fact there is no difference between the two accounts, including the names.
I would like to know if what I am experiencing is normal for EMC systems?
If so, why is the EMC system designed this way instead of preventing or at least alerting the user that the same account already exists on the system?

You can add as many accounts as you wish (with a Pro license), and there is no restriction on adding an account more than once, if that is what you want to do.

If you have added the same account more than once by mistake, just remove one of them.