Avoiding contingencies like this can be a good thing, since depending on the other contingencies it might make the deal more likely to go through, or to go through more quickly. But in most cases the buyer still has contingencies for inspections and probably a whole bunch of other things that will let them back out if they really want. Whether it's an "all-cash offer" or a standard mortgage, unless they are providing seller financing (rare), the same amount of money gets wired to the seller's back account at closing.
Am I missing something? Or is "all-case offer" in a headline indeed an empty phrase that usually signifies that the article is probably selling a false narrative based on misconceptions?