Does the door open inward or outward? What is normal?

I would also have them open inwards, just as they are drawn there.

I find outward opening impractical. To use the argument that the door was designed to open outwards:
Exactly, think about how often you have visitors who say goodbye and someone needs to quickly use the potty box again. You regularly get "jams" there. Experienced that thousands of times in my childhood when relatives visited the parental home, which was quite similar, only with a door opening outwards.

The rescue idea is not fundamentally wrong, but for me much rarer (hopefully never). And if it should ever happen that someone collapses and the emergency services need to get in, they will get in, since it is usually not a high-security door.

The only consideration for me would be if the door were executed as a flush variant.

I find sliding doors for the "public" restroom somewhat suboptimal due to sound and locking issues. There may be solutions, but aren't they comparatively expensive?

Inside - we have similar measurements. No problem

We only had a small hook in the old apartment. A strong tug and the thing would have been ripped out of the door. Regarding rescue in an emergency, that shouldn't really be a problem. We didn't really have any issues with sound transmission. On the one hand, we had a good toilet, so there wasn't much splashing, and we filled the gap between the door and the wall with these foam seals, which I believe are also intended for windows or similar. They have simple adhesive tape on the back. You can hear much more through our current solid wood door than back then through the sliding door.

Just sharing that from our experience in case anyone is interested.

If I say for safety reasons to the outside, I don’t want to cause panic but the neighbor of my acquaintance allegedly died because the paramedics could not get through the door in time. Someone had to come in through the window on the 1st floor. (approximately 1.5 hours delay). Now how good the window is, on the ground floor or 1st floor, how heavy the person behind the door is, this can somewhat relativize it but in the end it is a risk. Whether it happens to us? Theoretically you can participate once in the lottery and win, it can also be that someone participates lifelong and never wins. That is probability. Here it is important how serious the matter is and one’s own interest. For me it was said (in OP) it can happen to 1 in 10,000 and my son was 1 in 10,000. I say risk never again if it doesn’t have to be, but everyone has to decide for themselves. Regards Reza

Sorry, then every door would have to open outwards. You can also faint in another locked room. Bathroom doors nowadays are equipped with a latch on the inside, not a key. The door can be opened relatively easily from the outside, namely with a penny, euro, or something similar.

It's not about the lock, but the door. You get a lock on (usually you even have several doors with the same key in the house, there aren't that many different key shapes for typical room doors). In a sufficiently large room, it's not much of a problem if someone is unconscious there – you open the door and go in. If the person is lying directly behind the door, you have to press a bit harder to push them aside. But in a very small room, the door doesn't open but only crushes the person. Tough luck. The risk of losing consciousness is probably higher in bathrooms because most people first go to the bathroom when they feel unwell.