My friend's parents dropped a shampoo bottle in their new build, and it broke through the bathtub. I hope this rough surface will be more durable.

I'm imagining some rough sandpaper layer that comes off every time you shower until it's smooth anyway. Glue is expensive, you know?

There's so much about showers in hotels that I hate a good proportion of the time: super-slick tiles, high step-in tubs, accompanied by no handholds. I've gotten more sensitive to this over time but even when I was much younger, nearly took spills a couple of times.

That's fair. It's one thing to tell people "don't build things in such a way that other people would be put at risk", and quite another to threaten people with punishment for choosing to take risks themselves.