Love this post!
I do sometimes get the terminology mixed up but still keep on moving forward with it.
I think one can start with even generic lists as well as actual pieces. For example, for me , "work pants " is clearly one! But then the further test is, which styles or silhouettes do I reach for. It can be this simple at first because for other people, dresses or skirts might be there.
Yours is great because if how you've thought it through.
What has been helping me is thinking of what are my existing essentials vs what items SHOULD be present, that is , do I have ENOUGH "glue" or what; for example, did I have to give up something due to wear or fit and its absence is making it harder to create outfits.
And also, your review of Angie's list is a great reminder that these have to be kept current.
For me, " current" can mean "modern," with a definite style twist or evolution, but also can be just, does it have perfect fit and flattery and comfort so that it does function as an essential ( maybe a new brand or size fits better or fabric is more comfortable ).
Thus ask helps focus my shopping list. I find sometimes I might buy something random when really I need to focus on a new essential -usually this is when somehow I'm not happy with the fit-- pulling or creasing or too short or something- so it's hanging there but not working for me.
Anyway this is helpful for my wardrobe edit because having " enough" of these, but also not unnecessary dupes, helps me see where to go.