This is the preexisting dirt after piling it back into the bed on top of the hardware cloth (and after it has been rained on a couple of times). There are still a bazillion tiny rocks in it with patches of sod here and there.
If I had this to do over again, I wouldn't put back any of the native earth after installing the hardware cloth; I would dump it elsewhere in the yard and use only garden soil in the beds, or maybe some sand near the bottom.
This clay-based soil is a lot denser than you want your typical garden soil. There are a lot of minerals in it, but clay compacts after it gets wet and doesn't expand again when it dries. So air spaces disappear, it stops draining well and it slowly becomes tougher and tougher for roots to penetrate. It doesn't hold a loose structure unless you aggressively amend it with structure-improving material, and you have to do it consistently over a long period of time; that is, you have to turn it into some other kind of soil.
For now it's still relatively soft and loose, having been tilled and turned several times. (It looks solid, but I can poke a finger into it.) Hopefully roots will be able to get through it for some extra water and "trace minerals".