I am building a Knowledge Graph of automotive, building upon the auto.schema.org terms

Obviously, there are many properties which schema.org does not cover, for which it seems to recommend the use of schema:additionalProperty, like

<vehicle>
  schema:additionalProperty
    [
      a schema:PropertyValue ;
      schema:value 1682 ;
      schema:unitCode unit:MilliM ;
      schema:propertyID ex:wheelTrack ;
      schema:valueReference "Rear wheel track"@en, "Arka aks iz genişliği"@tr ;
    ] ;
.

However, I wonder what is the advantage over simply using my properties directly

<vehicle>
- schema:additionalProperty
+ ex:wheelTrack
    [
      a schema:PropertyValue ;
      schema:value 1682 ;
      schema:unitCode unit:MilliM ;
-     schema:propertyID ex:wheelTrack ;
      schema:valueReference "Rear wheel track"@en, "Arka aks iz genişliği"@tr ;
    ] ;
.