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I can't exactly remember but I think there are a few rare circumstances where you still have to quote things. Inside ${} maybe?

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According to this, it does not happen when you use variables (unless you explicitly ask for it), but it does happen on the output of the command substitution:

> A command enclosed in parentheses preceded by a dollar sign, like `$(...)', or quoted with grave accents, like ``...`', is replaced with its standard output, with any trailing newlines deleted. If the substitution is not enclosed in double quotes, the output is broken into words using the IFS parameter. https://www.csse.uwa.edu.au/programming/linux/zsh-doc/zsh_15...

I don't think there is an exception. Zsh still applies word splitting on process substitution (I suppose this is more natural here).

The way you put it, it does sound like an exception. But what I read, it does not seem to apply on process (or any other) substitution but on the output of command substitution (see under your sibling comment).

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