With deflation there would be no reason to invest your money, paralysing the economy.
Some inflation is needed; what we don't need is https://brrr.money/
Some inflation is needed; what we don't need is https://brrr.money/
You mean with deflation people will suddenly no longer want for more money? Sign us up!
No, they mean that people will want jobs and not find them. [addition: this is at least the orthodox view behind small inflation targets as policy, that on the whole it's the best trade off]
Either way, I'm not saying I believe the analysis, but when economists talk about the problems of deflation they aren't afraid that people will have "enough" money.
Even if you have negative interest rates on money, people will flock to the next basic human need that has its own liquidity preference. Once the yield on land or property falls below liquidity preference people will hold onto empty property. The solution to the problem is to neutralize ground rent via land value taxation.
Thus you have both a money cycle and a real estate cycle.
That's not so great for the people who need to borrow it, or want a job