Here's my final update on my D-Dock after Danny got me out a new one:
First, because this one was not defective, I'm able to slide my iPhone X (in Apple silicone case) into the dock like butter. Slides right in and locks. So there you go - if yours is defective (the Lightning cable coming out at an angle), then that's why your phone won't slide in properly.
I still think the build quality is a little slap-dash, and I also think it should be black since it doesn't match anything that well, but it's REASONABLY inconspicuous, that's good enough for me.
Oh, and for those as anal retentive as I am, the dock will scrape up the rubber mat on the right side if you slide the dock itself in and out a few times. It causes a rubbing on the mat that makes it look lighter where it's rubbed. Not the end of the world, but, you know... it happens.