The holder of non decaying money thus received the benefit of liquidity without paying for it, and they can rent out that benefit to earn interest which is how the magic of loss-less savings happens, it's just an inflow of interest to the money holder.
While in the case of fiat, the flow of interest goes to banks!!! Thus it is experienced as "necessary" decay by fiat money holders!!!
No thanks, I'd rather the interest is distributed among regular people rather than banks and there is no decay.