Consider way/1486486342

Should this be a pedestrian area (`highway=footway` with `area=yes`) or should this be a footway area (`area:highway=footway`) ?

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Which parameters for museum and subject ?

"showcasing information about the Solar System, cosmology, and spaceflight" as of https://en.wikipedia.org/wiki/Hong_Kong_Space_Museum

https://taginfo.openstreetmap.org/search?q=spaceflight#values
https://taginfo.openstreetmap.org/search?q=astronomy#values
https://taginfo.openstreetmap.org/search?q=aerospace#values

Probably multiple ? osm.wiki/Semi-colon_value_separator
"space" may be misinterpreted https://taginfo.openstreetmap.org/search?q=space#values
"science" values should correlate with "faculty" https://taginfo.openstreetmap.org/keys/faculty#values

Should "roads" inside the Road Safety Town be mapped?

Abandoned railway information is very debatable since it can no longer be observed IRL; it has been fully deconstructed (except for a tiny section as an abandoned railway bridge), and should be removed.

Sing Mun River has fixme, presumably about boat access.

However, afaik, there are no legal restrictions about boat access.

Where does the name "Lo Wu Classification Yard" come from? I've only ever heard of it referred to as "Lo Wu Marshalling Yard" (after it was no longer a freight yard).

name seems unsubstantiated

everything mapped here as lvl3 should be lvl6!

and everything mapped as lvl1 should be 4 accordingly