Currently, free version only allows one vault. And the main vault cannot be deleted. This means I can't delete the vault that stores all of my credentials.

This is a huge problem when users want to import newer data from another password manager without having duplicate credentials.

Since Proton Pass does not allow to merge duplicates, the only way would be to delete all and import again.

For example, I am stuck with the older version of my credentials on my Proton account and had to create another one just for Pass in order to import my data and use it.