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Each service for ancestry is good at certain things with certain data sets. Like MyHeritage is the best for EU dna matching and jewish ethnicity, LivingDNA is the best for british isles specifics, ancestry.com is best for US dna matching, etc. You might have some irish/scotish in your family tree because something sneaky happened for example, or there are some edge cases you could double check it with LivingDNA. I did for myself since I have a lot of british isles DNA. Ethnicity estimates are also just that, estimates. Very fuzzy in practice.
I also have a bunch of french ancestry, but it didn’t show up, and we realized it probably came from Brittany, which is a genetic exception to the rest of France for example, if you look closely at the blobs they tend to also include Brittany. I think it’s called Brittany due to some invasion or they were originally from Britain.
I also got a bunch of other family members sequenced and it lets you determine which came from what line because they tend to concentrate. Like I got my south asian genetics from my maternal grandmother after sequencing my mother and grandmother with myheritage.
Also in the article, I think you call genetic lifehacks genetic health or genetichealth a few times.