It seems you assume investment is generally good. As you can see right now people invest in anything just to save their cash from rising inflation, but the investments often aren't sensible to put it mildly. Valuations of many companies based on realistic forward P/E ranges are outright silly. Nor is investing necessarily beneficial for society in general. In fact many of these corporations are outright destructive, but capital gets allocated to where it can multiply the best, not where it might have a positive influence on society.

It's the fiscal policy of many countries that's massively driven up asset prices including cryptocurrencies. Those who didn't invest saw their savings printed away.

Inflation (of IOUs) is good for those holding the actual wealth (resources, land, farms, factories, real estate, etc - often through public shares). It's good for those who have debt denominated in inflationary currency. It's definitely good for some people and their business. What many people simply don't understand is they're not part of that group.

This is something I’ve thought about and while I agree that a deflationary currency would be detrimental to our constant economic growth, I wonder if that’s actually a bad thing. Do we really want constant growth and pointless consumerism knowing what it is doing to our environment? Maybe a deflationary currency would be good, as people wouldn’t want to spend it on frivolous things and only use it to buy things they really need. I don’t really know where I stand, but I have come to doubt my initial concerns over deflationary money and I wonder what others think about such a radical shift.

While this is the most thoughtful comment, it seems like without the effective equivalent of population caps, price controls, and a large redistribution network, a deflationary system would involve people fighting over progressively smaller pieces of the pie, while those who have more than enough continue to take a smaller amount of their resources over time until the effective expenditures of the wealthy are effectively zero. This also would effectively bar new entrants to the system, so children, those with little access to tech and energy resources, and those in developing counties.