I agree the highlighted sentence in my article definitely breaks most rules about emphasis fonts (though not underlining!). My excuse is: that one sentence contains the core kernel of my point. The other emphasis marks (when not used for before-main-content notes) are to guide reading the sentences out-loud-in-your-head, and only use italics.
My recommendation is to use bold only in that case. Bold + italic is generally only needed when you need nested emphasis, e.g. bold within an italicized section, or vice-versa.
I agree the highlighted sentence in my article definitely breaks most rules about emphasis fonts (though not underlining!). My excuse is: that one sentence contains the core kernel of my point. The other emphasis marks (when not used for before-main-content notes) are to guide reading the sentences out-loud-in-your-head, and only use italics.
My recommendation is to use bold only in that case. Bold + italic is generally only needed when you need nested emphasis, e.g. bold within an italicized section, or vice-versa.