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In some part because weather isn't the same in all English speaking countries.
A lot of the world doesn't get a significant amount of what Americans call "sleet", it's either mixed in with, or the brief transition between, rain and snow. The quirk of having the huge landmass of Canada up in the North, the warm waters of the Gulf of Mexico to the South, and no East-West mountains to keep them separated means we get huge masses of moist warm tropical air lifted high above dense cold yet dry polar air, that tropical moisture condenses and falls through that polar air and has enough time to freeze on the way down, completely and continuously for long periods of time.
Subjectively, sleet is snow's dipshit loser brother. Snowfall is silent, in fact it's silencing, it's like it sucks the sound out of the world. Sleet hisses like rain on fast forward, it's almost like pink noise. Sleet is denser than snow; an inch of sleet is more precipitation than an inch of snow; it has less surface area so it's harder to melt and it's heavier, so it's harder to move.
Not to be confused with hail, which is frozen precipitation that occurs paradoxically in the summer in vicinity of severe thunderstorms. Convective activity catches precipitation and throws it very high into the atmosphere where the temperatures are cold, so it freezes. This happens over and over again until it is either too large to be lifted again or it gets thrown clear and lands some distance from the storm. The major threat from hail is impact damage.