Alfred is a Commando or SAS veteran in some continuities, and even played a large part in training Bruce.
When empowered in the Injustice comics, he kicked Superman's ass with ease.
He only has powers in some timelines. And as much as Bruce can buy or manufacture whatever weapon he likes, some tough old guys like to just stick to basics.
When empowered in the Injustice comics, he kicked Superman's ass with ease.