It's not "unneccessary" if the low point exists.

I have difficulty believing the shorter one is named. There is also the possibility of different ones sharing the same name.

2. Connecting to a fence doesn't make sense either.

Please draw a new line. It obviously can't go over a hilltop and connect another one.

2. The force the department is operating may also be HKFS.

2. Which should be `=Fire Services Department` without "Hong Kong".

Please don't remove `name=` on `building=`. What you can actually do is remove the `=fire_station`.
2. FSD is more common than HKFSD, although you can argue `ref=` and `short_name=`.

It's not a `=motorway` though.

No idea why you would move the `power=line` here either.

Please don't delete other features that still exist. If the name is wrong, remove it.

Please don't de-duplicate `name=` in `building=` and `landuse=`. They serve different purpose, at least the local practice here.

Please don't attach irrelevant features to roads. This doesn't reflect reality, and makes editing difficult.

2. Don't use `highway=` + `construction=yes`.

2. This is `=stop` + `=stop_position`, not `=station`.

Please don't use lines as the `network=`.

Please don't add unopened features directly.

Please don't remove tree areas in parks. They are not the same.

Please use `landuse=cemetery` for general graves, and `cemetery=grave` for individual graves. `amenity=grave_yard` is for a "yard" inside religious facility.

You need to split the `amenity=parking` into `parking=surface` and `parking=lane`.

If you look at other layers, the line style should look different now. osm.org/#map=19/22.51587/114.22362&layers=Y
Which section did you broke through? That same user added way/511589097 and connected way/123533881 along the concurrent path around node/5004042973#map=19/22.51706/114.22212&layers=Y