A7-tagged, certainly, but how about A7-deleted? Non-admins don't (generally) know how to do admin work. If they did, they'd be admins. Speedy deletions are an admin task, so it is unreasonable to expect non-admins to be able to do it correctly. (Many can, certainly, but also, many can't.)
Wow! What a series of non-sequiturs. I'm not an admin after 5 1/2 years because I have never sought the power. Deletion is an admin task, but it doesn't exactly take a lot of training to push the right keys to delete something. If you add in the social and equitable aspects to deletions it becomes clear that a lot of admins don't know how to do it correctly either.
The word "generally" means "in most cases". I know there are exceptions, but *in general* people who are not admins are not admins because they are not able to be.
The skill required to be an admin is not a technical ability to delete articles - that's easy, you just click "delete", give a reason, and click "submit". It's the ability to work out which articles should be deleted. It is that which we don't trust non-admins to be able to do.