Why don't public restroom stalls have OPEN/OCCUPIED indicators like porta potties do?

I hate peaking under the stalls or knocking doors to figure it out. The answer is so simple.

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We have these for years in Europe

Where is the 6 in gap between the door and stall??

America

cries in imperial units

To be fair, it sounds better to have a 1 meter gap than it does to have a 3 foot gap when you have no sense of scale.

Laughs in civilised countries that use metric

slides under your stall

don't forget about canada too

You got me there 😂

I thought this is everywhere

And I've never been to Europe

I'm middle aged and I don't recall a time in my life when vacant/occupied indicators weren't on all public toilets.