Why can't I change some blocks into stairs, half-blocks, or fences?

One day, I decided to build a white structure.
And then I realized something.
The only white wall available was the Diorite Wall.

Since the concrete blocks in each color don’t even come with stairs or half-blocks, it’s understandable that they don’t have walls (though personally, I’d be really happy if they did), but even the Quartz series blocks, which do have those features, didn’t have walls.

I’m really happy about the addition of pale oak and shelves, and I use them all the time, but I’d also like to see more color options for the walls.

Furthermore, concrete possesses such immense potential that it would be a shame to simply leave it alone after merely giving it the unique property of “turning from powder into blocks when it comes into contact with water.”

I understand that incorporating elements like “putting it in a wooden frame...” would be difficult from a gameplay perspective.
However, it’s also true that in the world we live in, concrete stairs—or anything else made of concrete—can be easily built by anyone capable of working with concrete.

If you’ve read this far, I’d like you to consider adding walls, half-blocks, stairs, and other elements made of quartz or concrete.

I’m sure many players are eagerly awaiting this.

I know it must have been really hard to read since it was written using machine translation, so I’m incredibly grateful to you for reading this far.