agreed, but if we cant onboard 8billion people self custodially RIGHT NOW does it mean that we should give up trying to get the 10s of millions of people who potentially use it atm to do so? they are the ones that will spread the word around to their social circles and if all this decentralization technology fails because one custodial provider stopped serving US market (and will probably expand the list to all the overreaching shitholes of the "developed" world sooner or later) then we didn't achieve much.
We need the first couple 100m of users to be as self sovereign as possible - they are the critical mass for any kind of changes needed to protect the unfortunate souls who won't own their own utxos in time
This also buys us time to figure out new technological advancements that need discovery and maturation before wide adoption