Sure it's unusual. Just to check, I looked at 20 pages of songs in the Sing Out book. Not one F# there.

There isn't even one in the Hard Times & Blues section, although there are a couple of F#m's.

It's not an illogical chord, but it's not a usual chord, either.
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Will, I agree with you about dense chords which muddy the music. I think the predilection for muddy sounds or pure sounds is inborn, and I was born with a desire for purer harmonies. Not that everything has to sound like 'Jingle Bells', mind you.

As a teenager I went to a Lutheran church where the organists played a Bach piece as a postlude every Sunday. (This is traditional.) All these pieces seemed to thunder to an end with a loud series of discordant blasts.

We kids thought that Mr. Bernstein was simply smashing keys at random to get it all over with. But no, Bach wrote them that way.