Mmmm...going to have to disagree here, at least in part.
Using a tiny tarp without the knowledge or synergistic gear to work with it is, yes, a bad idea. However, one can definitely make a tiny tarp work in summer (or three-season, down here in the subtropics) fairly easily, given the proper skills and/or synergistic gear. Personally, I get by with an undercover/poncho and tiny asym tarp that has kept me dry and warm in a tropical storm with fairly consistent 20+ mph winds (gusting as high as 45 mph).
Now, would I try that in conditions where sleet is likely? Probably not; I've not slept in such conditions often enough to be confident of my skill level. But the key there is my skill level, not my gear. I'm confident that my gear can keep me dry enough that, given a skill set that would work with the possibility of getting a little (not a lot) wet at those temperatures, I would take my current weather protection set up.
YMMV, of course, and I am not advocating that anyone put themselves in danger. Know your own skill level and equipment's limits!
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