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It's already possible to vieuw the content without logging in but why would you want that if you can create unlimited disposable profiles? Or you can just login with your existing npub.
Discussion
Because most first users want just viewing before participating. Making an nsec first is little bump in the road. It is good when your bought in to nostr.
It's actually more focused on new users who are not familiar with Nostr yet. Creating a new Account/nsec is just a few easy steps. But if you really don't want that you can view all content without logging in. But then you are just browsing the Nostr ecosystem.