That is true but there is a fine line. Right now it is not too much of an issue since there arent too many use cases for HBD.
However, we need to balance the incentive to hold versus the incentive to use as a currency.
If, for example, the interest was 90% (going to the absurd to make a point), then HBD would never be used as a currency since most would save it and just let it grow.
Plus, keep in mind, this is at the blockchain level. There is nothing preventing an application being built on layer 2 offering whatever rate of interest it wants.
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Oh yes and all that you say here is true as the actual use of HBD is an essential part of it's make up.
I am sure that the witnesses have given this great thought, so we will wait to see what happens in the future.