We don't need blockchain for decentralization. That's what we're dismissing. Blockchain is a set of cancer cells that have metastasized into the existing zeitgeist surrounding decentralization efforts. It offers nothing, and just poisons our existing work.
Decentralization doesn't have inherent value, and has a whole host of problems that cryptopeddlers don't want to either acknowledge or pretend to solve.
I think that when building the internet and the web, decentralization was assumed to have a lot of value, do you disagree with that?
It wasn't inherent.
The value was "in the case of global nuclear war it would be nice to have independent centers that could still continue to operate in the aftermath". It was a solution to a very specific (though thankfully theoretical) problem.
"web3" offers no such problem, but loves to scream "but decentralization!".