Hi overactive imagination,
It certainly looks strong and sturdy and the gaps between the slats are fine but for king or queen sizes I would add center support to the floor to make sure it meets the warranty criteria for most mattresses.
It’s hard to see from the picture but it looks like there is some kind of center support but it’s not clear if it reaches the floor.
You could always add center support along the lines of some of the options in post #12 here.
Phoenix