use polysyllabic in a sentence.
Probably the fact that it strongly discourages polysyllabic words...
I have too many educated friends who write by maxim "Never use a short word when a polysyllabic one will do".
One thought I want to explore in a later version is using cmudict's stress patterns for polysyllabic words, but ignoring any stress/meter rules for monosyllabic words.
The number one rule I have taught to people who speak English as a second language is to always always always learn polysyllabic words, especially those with 3+ syllables, to learn them back to front and never from front to back, which is the natural way to approach learning long words.
What you're asking is that instead of concisely putting forth their point of view posters puff up what they're writing with pompous polysyllabic mini-essays on Every Goddamn Thing, with copious footnotes, links, etc.
And one of the major proximal causes of this is the loss of tones, since it's lead to homophonic ambiguity, which has been corrected through the formation of polysyllabic neologisms, which break many millenia-old connections with Classical Chinese.