Re 1: this style references Route3/Route9 Tsing Long Highway having `=motorway` all the way through.

Re 2: perhaps I can just extend `=primary` to reach the roundabout. A supporting argument: Chek Lap Kok Road has inter-district abilities by leading Tuen Mun vehicles to access the airport support area.

Re @Patrickov, I think their point is more focused on debating "motorway_link is wrong" with "argument by absurdness": if motorway_link can be doubted as "this should be motorway instead", then every other "*_link" can do the same, and then there cannot be any progress.