Yes, but not always. It depends on what U want to do.
(BTW, the [Menu] button atop the vertical black bar reveals the widgets.)
Here is a little silliness with self-reference in response to [Diminutive ~ Pic and a Word Challenge #90], which displays a good use of a long word.
Wanting Five
Ah, “diminutive”!
Big word for “tiny” fills out
first line of haiku.
Hmmm. Would anybody want a long synonym for “tiny” in a 5-7-5 haiku? Nah.
BTW, self-reference in language really is a big deal, as explained (among other places) here and here. It has also been joked about in other haiku. Some examples are here and here.
Mellow Curmudgeon 
This makes me smile… with just a hint of giddiness. 😊
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You tickled my mind with this haiku, Mellow. ❤
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Very fun discussion! Long or short — I love words — especially those that express what they mean, and mean what they express — like slink and hack!
power brokers slink
hack out ego flattery
tainted to their core
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At the moment, I’m hunting short words instead of long ones for creative writing. Long, Latinate words remind me of bureaucracy and institutional paperwork. John Major former British prime minister was notorious for saying things like ‘it is not inconceivable that…’
For me, having said all of that, one of my favourite words is Reciprocity.
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So far as I know, “reciprocity” has no shorter synonym. Dunno how anybody could say much about the pleasant concept w/o using the long and mildly unpleasant sounding word.
The use of a double negative to make a tepid positive (as in Major’s “not inconceivable”) is indeed pretentious. Maybe there was a little ironic humor in the first few uses, but now it is just annoying (and common in bad academic writing). One of the few good things about politics on my side of the pond is that our pols avoid it.
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