As far as I can tell, people tend to use clarifiers when they either can't interpret a particular card, ...
It's something that seeme to have sprung up this century: back in the Bad Old Days we interpreted the cards that came out, and if we couldn't, then we thought, and thought, and thought some more until we could.
Nowdays, people want one-second returns. They'll google and expect a "hit" in a few seconds, as opposed to taking their question to a university-library and reading through seventeen reference texts to find a much deeper source of information. Whan trained that way by google, it's easy to fall into the habit of thinking at first glance: "Crap, I don't understand this card in terms of this position, let's pull another one", instead of doing the hard yards, thinking-wise, and maybe actually *learning* something new about Tarot, that particular card and the human condition by mulling things over a bit more.
Before the universality of on-line search engines, readers would sit with a puzzling card until they "got" it.
... or are unhappy with the outcome
<frowning slightly> This is the reader-equivalent of the paying-client who goes to seventeen different readers until they find the one that says what they want to hear.
Then later, life doesn't reflect that very last reading although it may accurately reflect all the earlier readings they discarded, and they moan about how Tarot doesn't work.
I'm sorry if I sound grouchy, I'm really not feeling grouchy. It's just that I see this sort of thing over and over and over.