If I buy a government bond on the market I didn't redeem that bond. Only the government can do that by paying me the face value of the bond. I see that you lack basic knowledge about finance.
You keep thinking in terms of government's bonds. Stop it. The videos you've mentioned have no relation with the questions you're making here. You're asking “
why would I want to buy a number”, I'm telling you that this number can be used to exchange stuff; it's a medium of exchange. There are people who find it
useful. Focus on this statement.
Redeemable means able to be bought back by the issuer. It doesn't mean able to be traded.
No, it also means able to be traded:
gain or regain possession of (something) in exchange for payment.
They are securities. Bitcoin is a number.
By the same reasoning, gold is also a dead rock. Yes, you can make jewelry, but what's the point of jewelry if you don't care about shiny necklaces? What if you don't care about electronics? What if you don't care about medicine and dentistry? Guess what: Some people do.
Same goes for Bitcoin. Some people are satisfied by using it as a currency, because it has perfect characteristics. The fact that you're seeing it just as a number doesn't make that false. Do we agree that if two individuals find it satisfactory, it instantly gains value? (Whether that's personal or market value)