Isn't basically every decile getting richer (i.e. able to afford more things) thanks to economic growth?

What if I don’t care about affording more things? And instead want to live in an ethical society that prioritizes stability and universal access to housing, healthcare, and education?

No. It's a k-type curve where the high deciles are getting higher and the lows are getting lower, so to speak.

There is increasingly becoming more of a divide between haves and have nots, and it has a temporal component because of how equity has appreciated over the last decade or so. Both housing and stocks.

People from a decade ago have seen absolutely unsustainable appreciation in their assets while doing nothing. That is putting them at structural advantages against younger generations that will not see those same appreciations. It's like the bus has left without them. No matter how hard and fast they run, someone asleep on the bus will always be ahead of them.