Keep in mind that "deep ancestry" and the Genographic Project have nothing whatever to do with genealogy. That is so far back it's about hunter-gatherers armed with rocks roaming the planet, displacing one another geographically whether by force or sometimes a more attractive culture, and exchanging genes — but not keeping genealogically useful records, only at best the fossil record.
Off Topic — hey it's not me you're disagreeing with it is governments, the genealogy community and genealogy professionals. Have you not noticed that censuses aren't available for most living persons and that living persons are not presented on reputable online gedcoms? It is unethical and now you know.
Back to our regular scheduled program.
The trick, in my opinion, is understanding both the possibilities and the limitations.
On one of my lines, it HAS been of absolute value/use. There were 2 distinct lines/ possible grandfathers. Solid paper trails exist for 3 of 5 sons, but not for the other 2. My line comes from an apparent grandson. This cooperative project compared a number of proven lines, with some unproven (or otherwise unprovable). The result absolutely grouped "my" line with those who were already proven, and absolutely removed the 2nd line as a possibility.
Since many early American genealogies have been circulated and accepted, and later found to be inaccurate, this can also help. This happens to be true with this family.. that certain men (of the same first name) were often confused, by lack of finding all the possible records, or persons "jumping" to conclusions. Thus, it can be verified that William (of this county) does NOT match the lineage he had previously been believed to be..while William (of another county) does match.
Obviously, many new persons are not aware of the distinctions, and look for something out of testing, that it does not promise… ie, showing ancestry without comparative projects, using already available records.
For some… the broader view is what they are interested in, and they fully understand what it represents. How they apply it to themselves is a matter of choice, so long as they know what it involves, and what they want to know. People define "heritage" in different terms.
(hope you and yours have managed well through recent rain issues, by the way)