Enable Users with Email Template Design access to send tests

Full license users with the permission to design Email Templates are unable to send a test email to themselves.

Once they click on 'SEND TEST' in the top right corner, they get an error message (attached). According to Support, this is expected behavior. This doesn't sound logical to me, why shouldn't they be able to send a test if they are able to design Templates?

I’d love to see this enabled within the Design permission, so users who are able to set up templates can also send it to themselves to test.