'Plastic', and then 'vinyl' again?(In the OSM wiki 'Key:building:material' entry)

What is the rationale for the ‘Key:building:material’ key entry in the OSM wiki having a key value of ‘plastic’ and then again having a key value of ‘vinyl’?
As you may know, there are many vinyl-based building materials in use today.
And vinyl-based compounds are often referred to as ‘plastics’.
So maybe I should just call them ‘vinyl’ or ‘plastic’ as one.
But the ‘Key:building:material’ key entry in the OSM wiki has a ‘plastic’ key value, and oddly enough, only ‘plastic vinyl strips’ is organized under the ‘vinyl’ key value.
What is the reason or rationale for this split, or for writing one more when there is already one?
Do we really need to break it up like this?

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/plastic-and-then-vinyl-again-in-the-osm-wiki-keymaterial-entry/100415