SarathW wrote:Could someone help me to clarify this please?
I don't know that I can clarify per se, other than to say that you're not the first to observe that the Abhidhammic interpretation of these terms has evolved beyond their original Sutta usage.
Modern meditation guidance that is rooted in the Visuddhimagga is similarly founded on the more technical and prescriptive Abhidhammic interpretation.
How you proceed will probably depend on what set of resources you find most authorative or useful.
"Having understood name-and-form, which is a product of prolificity,
And which is the root of all malady within and without,
He is released from bondage to the root of all maladies,
That Such-like-one is truly known as 'the one who has understood'." (Snp 3.6)
"Whether I were to preach in brief, Sāriputta, or whether I were to preach in detail, Sāriputta, or whether I were to preach both in brief or in detail, Sāriputta, rare are those who understand." (A I 333, Sāriputtasutta)