To my ears chords each have their own quality and how they sound (and what feelings they might evoke) depends on the context. In general plain majors are strong/simple while minors are sad, but add2 chords or 6th chords can be even sadder than triads with a minor 3rd, depending on what comes before and after and what everyone else might be playing. It’s not quite as simple as Cohen’s Hallelujah but he had the key to the basics.
There is some discussion about chords with more than 3 notes being ‘made up’ of overlapping triads, or in the case of 6+ note chords perhaps non-overlapping triads. An example: Is a “minor Seventh Chord” basically just a combination of a “minor Triad” and its Relative “Major Triad”?. What is the value in this? Does it help us choose and/or construct chords which evoke predictable responses in the listener?
I usually think that power chords (root-5th) are not really chords - we might as well call a 4th or any interval a chord. The usual triads (major and minor) are fundamental while anything else is just notes added for extra color, or to serve the harmonic movement or melody, or just ornament (with or without a note from the basic triad omitted). So is there any reason why we might need to notice that a m7 chord is a pair of overlapping triads from two scales? Does this kind of analysis explain how someone hears something like the minor major 7th chord? Are not perceptions of chord value mostly a matter of acculturation, of what sounds good or right in the specific context? What’s missing if we start with the two basic triads and then talk only about adding extra notes, or suspending a note, or voicing an inversion?
This might look like a bunch of different questions but it is really just one question about the analysis of chord construction - and how this is affected by context.
N.B. This is not a question about the ‘stack of thirds’ view of chord construction (see e.g. What is the "stack of thirds" in chord theory?). It is about triads and overlapping triads.