you don't need any counterparties to own/hold bitcoin though. just buy it and send it to cold storage.
Discussion
I don't even fully trust the hardware wallets with their firmware updates. See Ledger's wobbles last year. I'm aiming for diversifying risks through keeping my bag in four different places, some tax advantaged, while making sure that relatives can find them all in case of my demise. I know that has other risks but there is no single perfect solution.