It is all well & good having a decentralised system for our 'money', but that brings problems.
No one is looking after your 'money'.
Lose the mobile, get your computer hacked, your funds are gone into the ether of the net.
So we go back to centralised system where someone stores the keys for us, which works until the exchange gets hacked.
Paper Wallet seem to be the best solution so far, as long as they are created in secret, using a bootable linux USB stick.
But most users will find this difficult if not cumbersome.
But maybe a solution is on the horizon, invented in the 1980's known as “zero-knowledge proofs”
Time will tell
https://cointelegraph.com/news/how-to-recover-your-wallet-if-your-private-keys-are-lost