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> then we need to come up with better reasons

the best reason is to allow more risks to be taken.

A 100% reserve system means that a bank would not be able to make loans that they'd want to make (aka, a customer wants the loan, and they can service it, etc).

A 100% reserve system would seize up at a small shock much more easily than a <100% reserve system. The reason is that if a bank required 100% reserves, they would not lend money (even to another bank), even if the lending would've been profitable. This means a bank must standalone on an island, rather than as an inter-connected network with other banks.

You pay for <100% fractional reserve system with some risk of bank runs. If the majority of people can get a gov't backed guarantee that they would be made whole, these runs tend to be minor or not happen at all. And overall economic activity is smoother due to more liquidity available to lubricate everything (e.g., it's easier to get loans to do things to provide more economic activity).




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