Nobody is forcing you to use e-cash. You can always use Bitcoin or Lightning in a self-sovereign way. Maybe you can become the "honest banker" for others then with a Lightning node.
However, there will always be Bitcoin users (especially when Bitcoin becomes more popular) who would rather give custody of their sats to someone else, no matter how smooth the self-custody tools will be.
E cash sounds like a solution in search of a problem at least partially
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