I certainly see the use in a garden tub but not so much in a shower. Just a wild guess but it could be that there is no P trap and the stopper is ment to be closed when not in active use?
Post back if you find out the real reason.
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Paul, Kathy, and Tux the Mini Schnauzer
2014 Tiffin Phaeton 42 LH, 2013 Honda CRV
"When the time comes to look back, make sure you'll like what you see"
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