Wait, don't use each segment to create a `=multipolygon` !!!

This is wrong. These `building=` should be changed to `building:part=` (but not all in HK)

OSM 101: Don't align `building=` with the roof in imagery (which is further complicated on hillside with more expected distortion at base)
You made them the worst, on top of the `=tertiary`

Why delete the `building=` + `addr:housenumber=` ???

Why delete the `house=terraced` + `addr:housenumber=` ???

OSM 101: Don't align `building=` with the roof in imagery (which is further complicated on hillside with more expected distortion at base)
You made it them the worst, on top of the `=tertiary`

"Linear" means linear routing, ie routing along lines. `highway=` + `area=yes` should only be used when omnidirectional area-cutting routing is needed. This doesn't seem to.
What "triangular" is being discussed? You should not remove lines inside, as they are needed for routing in both cases.

Unless you describe more clearly, or provide a photo, I don't know what you looked at. It has been changed twice to `=path` , and `=footway` before. It's the app and ultimately user's responsibility to use difficulties and life cycle.

Wrong comment: You should simply move the `=service` road, and not delete other `highway=`

HK commonly has `highway=` roads passing through `building=`

HK commonly has `highway=` roads passing through `building=`

Why move the `building=` ?

Why delete the `=service` road?

Why deleting `highway=` and `building=` + `addr:housenumber=` ?

There's no need to move both `highway=` roads and `building=`

Very obvious mistake of mistakenly attaching vertex. Don't delete details, and changing to simplistic shapes.

Why deleting the details, and changing it to right-angled corners?

N-th deleting `building=` without even changing to `building:part=`

Why are you touching `tunnel=yes` + `layer=-1`, and what does this do?

1. Roads passing through buildings common situation
2. You simply moved it outside the `landuse=residential` again to other side