"Except that without the company, the rest just falls apart, it might still exist on servers, just minus everything that gives it value stripped away"

And that is exactly what blows my mind when I hear so many people naively talk about crypo and blockchains. Somehow they have adopted the false belief that if you have a decentralized system, it can continue on even if, and after, its founding company folds. Yet in reality, nothing could be further from the truth. As you so accurately pointed out, there is so much more to a successful coin or blockchain than its blockchain. Without the company behind it (providing core centralization), the rest is just a pile of unorganized parts which will very quickly fall apart on their own, and then everything is lost.