Does this sound like a unreported case of Leuko-Melanophobia?
In general terms I agree with TOI and use the "If it ain't broke..." theory. How's this; even though it might make not make sense to other widget makers, I don't promote physical widgets from the widget article site and there are only two older articles with non-reciprocal links mentioning the product site.
On the other hand, the article site has been adding functions and whole sections for years that add no value to the articles themselves but improves the site on the whole because the same users might want them. The physical widget site is half the age of the article site.
The domain name is versatile but from our perspective we haven't gone beyond it - having the physical widgets on site might change the impression G or others have of the domain and site intent. It may be important to note that we sell the widgets but the site is not a store.