That's a nice thing to build, but is having such an accurate clock source at home actually useful for anything?

Not specifically other than having a cool toy.

However, I'm doing research into being able to turn this into a short range WWVB transmitter as I like radio clocks but my area does not get good reception. So I suppose, there's an ultimate end goal there.

I made one for my Citizen RF synced watch. It works.