All I Know is that: those early-Americans we are so fond of quoting: used Caps pretty much as you describe. As do I.
But what do I Know!?
[Caps saves n keystrokes/merely for italics within the antediluvian interfaces, up with which we must put ..even in 2017 er, qed]
But what do I Know!?
[Caps saves n keystrokes/merely for italics within the antediluvian interfaces, up with which we must put ..even in 2017 er, qed]