I don't think Wordsmith's discussion
of Cassandra mentions what seems to me an important
part of her, namely that to call someone a Cassandra
is a real pejorative, they are regarded as noxious
nay-sayers, gloom-mongers, predicting only tragedies,
never happy things.

A sagacious old-timer reminds me, in a PM, that when we call a person "a Cassandra", we are talking about a naysayer, and a party pooper, and perhaps worse.

I have revisited my ALAD with this new insight in mind:

Cassandra was known for her gloom.
Her predictions were all full of doom.
Yet those who believed
Were often relieved
That fate destroys every bloom.