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in my long time of remodeling i do belive i have only seen 10 to 15 flanges screwed to the floor. Only thoose were wood sub floors. I have never yet seen a flange screwed to concrete
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If this were limited to concrete, I would understand that there's at least an argument to be made.
Not screwing the flange to a wood subfloor is just lazy, sloppy work with a "screw the customer" attitude (no pun intended).
There's a lot of showers with tile on greenboard with mastic too. Doesn't make it right.