It should be `level=-3` , but you should not add that to `route=light_rail` etc when they don't have such a concept. It's only refers to physical structures and functions on them.

It's the software's fault. Not designed properly.

Another thing: `level=` corresponds to `building:levels=` which is above-ground only. The actual level numbering should use `level:ref=` .
Here it is `building:levels=5` + `building:levels=3` , not `building:levels=8` . The ground floor is `level=0` + `level:ref=4` for remote stands access.

Btw need some time to fix the whole thing.. So you can work on elsewhere first.

The problem with not using `=multipolygon` and creating a new `way` for the same outline is the copies easily and eventually becomes misaligned. And the points on one area or `level=` doesn't get referenced back in others and the `building=` .

Also don't make 2 `aeroway=gate` for each `=level` , which result in duplication. It is 1 `aeroway=gate` spanning `level=5;6` .
https://framagit.org/PanierAvide/osminedit/-/issues/24
https://framagit.org/PanierAvide/osminedit/-/issues/34
There seems to be critical flaws with OSMInEdit, although JOSM isn't great either. The `indoor=` features don't snap to the `building=` , creating a mess.

1. As I have said, please don't delete then recreate the same thing. You can modify it directly.
2. Please don't add land info to the `building=` . That's irrelevant.

I can do it later. The alignment of the whole thing needs to be fixed first before you work on it more. You can work on other concourses for the day.

1. Please check carefully before creating. There were already `aeroway=gate` here.
2. Don't add `Gate` to the `ref=` . Only the number should be used.

Reverted /changeset/147922918,147914469 Shatin mountains: Needs more discussion

osm.org/changeset/148004479

Reverted /changeset/147922918,147914469 Shatin mountains: Needs more discussion

osm.org/changeset/148004479

1. Please don't spam hashtags. `description=` is not for advertising. I can very seriously explore the coverage with `service_area=` but it needs to be geographical.
2. `wikidata=` and `wikipedia=` are only used for the unique entity. `brand:wikidata=` and `brand:wikipedia=` has already been added.
3. `branch=` is for the branch name only. `brand=` already covers the other part.

Reverted /changeset/147717225,147717299 Shatin mountains. Needs further discussion.

osm.org/changeset/147919633

Reverted /changeset/147717225,147717299 Shatin mountains. Needs further discussion.

osm.org/changeset/147919633

There's no reason to remove these if you aren't updating further. If you don't explain yourself and continue to do this, I will suspect you of removing competitor info in a conflict of interest.

5. Smoking bans indoors is a law. These defaults for a country don't need to be added.

3. `website=` is only used for a unique page of a facility. At most `brand:website=` is used. It should rather be retrieved from the `brand:wikidata=` .
4. I have already added `ref=` . `note=` is for notes in editing only. It's not for public use.

2. Please don't add redundant info in the `branch=`

Please don't delete other things without a reason. And not repeatedly. They exist for good reason.

https://mapping-bus-routes.readthedocs.io/en/latest/
https://osmand.net/blog/guideline-pt/

Ok now you decide to remove things. Any more to say about your reasoning?