Depending on how clogged the drain is, ive seen those be useless before. The general case for those to be useful is that main drain is only blocked because the user closed it purposely. If the drain is clogged it becomes pointless-ish

this also assumes the tub doesn't put out water faster than the drain can handle (from experience..)

Yea my bathtub has one of these that helpfully increases the window between “the right level” and “overflow eminent” by about 4x the fill rate without the overflow drain, but certainly can’t handle the extra water indefinitely. I became fascinated by this metric/window when I almost overflowed the tub when I missed a timer.

Y’all know that post about the importance of walking and getting off your phone? I’m your altogether-normal, socialized coworker that’s in the bathtub 2:30-3:00PM doing pretty much the same thing being described there. What a place to be and think!

Sorry I can’t respond to your IM right this second, I’m thinking about the fill rate of my glorious tub, it’s failsafe features, the pothos over my head, the spider friend in the corner, and - before you get too concerned - whether these new bugs warrant further review of network architecture we’re building out.

I love the tub, and I make no apologies for it. Good morning HN, thanks for reading.

That little drain feeds into the same pipe and trap. If the pipe is clogged, that little drain hole is useless. The purpose of the drain hole is saving your bacon when you intentionally plug the sink drain to collect some water and then forget to turn it off.

there's usually another drain in the bathroom floor, at least where I'm from

I think it makes sense to have those in a hotel room, it'll help with more serious cleaning as well if needed. And it is needed. I've heard Stories.

Same. Every bathroom in my house has that. Though the kitchen sink does not, now that I think about it (I'm in Australia).

That’s very common in Asia where any rooms with a water source (kitchen, bathroom) also has a floor drain. Even balconies often do.

Not common at all in the US though new construction may include them in laundry rooms.

They’re actually a really smart idea and pretty much eliminates the risk of a water source leaking.

Not here in the US. It is really kind of stupid.