> Has worked as designed for almost a decade

"worked as designed" can be said for every thing. Everything works as designed. Yet gets hacked/stolen/cracked/misused. Banks are working as designed. And so is the government. Just that the majority will dislike the design because they have no say in it.

> You can store them yourself, no bank needed

And then you can loose it yourself too. Remove all the safeguards which was built thru decades of learning and allow everyone to shoot themselves and everyone else in the foot.