That's how progress is made, tho. I can't think of much use for concrete blocks with fiberoptic fibers embedded in them either. But, that same principle might have application somewhere else. It's the same with everything.
The BASF company makes Basotect foam. That foam was originally used in aeroplane seat cushions because it wasn't flammable. It wasn't until someone tried to use the stuff to clean a mark off a wall that they discovered the Magic Eraser.
Product literature - Basotect (MF)
Maybe those concrete blocks with the hard glass fibers embedded in them are the ideal thing for cutting through rock (as when making a tunnel through a mountain).
See through Concrete!
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