It kind of failed if you had a fancy CD player (or CD-ROM drive) that could show the lengths of tracks, if every other song on an album is 3 minutes long, then the last one probably isn’t 30 minutes long.
I don’t know what the point of this post is, other than that it sucks when a modern release removes the hidden track 
i’ve got a few vinyl records that keep the hidden track on a different groove. the record will spin and spin instead of reaching the end and detaching the needle, so you need to manually lift the needle and drop it into the groove of the hidden track. makes for a more interactive hidden track listening experience
and i’ve heard of musicians who’ve put two concurrent grooves of vinyl, leaving the hidden tracks extra hidden
There’s a band that had all their tracks on a serial so you’d get a different experience each time.
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