Or does it?
Does it matter?
I was told to look it up when I mentioned that cash is king in regard to using a cc vs cash.
My response:
Technically, it kinda does. Debt Cards are more liquid than a Credit card. (P.s. So is Cash)
Debt Card Fees are lower.
Thus, pretty close on that side [with regard to retail], but a typical common usage has taken over on the street. -ish.
The ish: Cash is king will also mean the person here first with payment (Payment is liquid to the dealer, but for them, that liquidity is coming from their payment processor… yet, again, cash in hand vs the guy they’re holding the loan for over the weekend IS STILL KING. A dealer is guessing that their loan holding company will accept your application. They have up to 5 days or so to decline to buy the loan from the dealer.
In fact, the dealer can take the car back in that first 5-10 days if they can’t sell your debt.
SO, yes, liquid cash is king, and tangible cash is the MOST LIQUID.
Conclusion: the colloquial/common usage is essentially the accepted meaning in much of the American-speaking world. Remember, English is a fluid and ever-changing language. Knowing its history is good, and I would argue that its historical & financial-world usage IS in line with the common less formal usage.
The post:

“The financial system has been broken for years. This is the “exact change” we need.”
My response is to:
Google “cash is king origin”, you’d be surprised to learn it doesn’t mean that notes and coins is better than card…
— Lewis Farley