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It works great only for a limited number of use cases.

It's terrible for unpopular content, it is not immune to takedown notices nor is it very resilient in the face of a determined adversary.

Backing 'long tail' content with webseeds works well for Bittorrent.

...but that's the same as saying let's back the decentralized web with centralized resources erp.

Exactly. Which begs the question of why bother with the decentralization part at all of long tail / unpopular content?

That's what zeronet is for.

Could you expand on that?

Zeronet offers no anonymity, you have to use Tor for that.