This only sounds ridiculous because you replaced the things the OP was talking about, with your own, to make it sound ridiculous.

"Is it about being a decentralized caching layer? Is it about permanently storing content? Is it about replacing my web server? Is it about replacing DNS? Is it about censorship resistance?"

websites at the beginning did not decide to be a caching layer - they decided to be websites. they did decide to permanently store content. they did decide to use web servers. they did not decide to replace dns. they did decide to be about censorship resistance.

now imagine you put up a website, put some time into it, and it may or may not be up at a random time in the future. not a product that's usable.