As far as the value of spending vs saving goes... you know what is valuable? Stuff. People do all kinds of useful things to get stuff. You know what is not valuable? Savings that just sit there. If savings just sit around doing nothing for years then it's no good to anybody until you pull it out of savings and spend it on stuff. Banks invest savings in order to make money, which stimulates the economy because the savings are used for (hopefully) profitable ventures. Savings is investment when you put your savings in a bank rather than your mattress. Money has no value on it's own. It is only valuable when you exchange it for stuff. Currencies with no velocity are not currency.
Learn about time preference. It's one of the most important and relevant concepts in the Austrian theory. There is no such thing as money that just sits there
forever. Saving money means having a low time preference for current consumption, which means delaying the consumption for future needs. For situations where the time preference for consumption has increased. Therefore saving, or "hoarding" as some idiots call it, is not putting money away for good. It's saving money for future consumption.
It's total and absolute folly to have a monetary system where consumption is artificially incentivized. That is wrong on many levels.