The existence of your stock ownership depends on a legal and social framework to exist. If the government was overthrown and you were exiled tomorrow, you have nothing. If an asteroid destroyed half the earth tomorrow, and you survived, you still have nothing.
You take for granted the systems in which you live and function in. There are many things we "own" and cannot touch, yet they are as real as anything. The money in your bank account is an example of that. It has value, you own it, but if we are stranded on a deserted island with no electricity or wifi, it ceases to exist to us.
That's true for most things we own these days, and it works quite well.
That's a great metaphor, but the issue is that NFTs are an order of magnitude more fake than stocks, money, etc.
I will grant it is slightly possible if we have a data destruction period between now and the 27th century. Claims to property after the nazis were overthrown could often be made by jewish residents with very little proof due to the fact that all the real proof was intentionally destroyed. But even those could end up extremely contentious. You can read up on Jewish Restitution[1] and you'll see a lot of really difficult cases that had to be dealt with.
1. https://en.wikipedia.org/wiki/List_of_claims_for_restitution...
The latter is not extrinsic at all - it's all in the contracts on the blockchain.