I think that depends on what you mean by "large amounts." If we're talking about cash savings to whether economic downturns, pandemics, etc., presumably we should be looking at what is large relative to the operating costs of the company. In the same way that it's common advice for individuals to have some number of months of living expenses saved for emergencies, I think that also makes sense for companies, and I don't see that portion of savings being a threat to the economy.