Only a number of years too late...

It's worth noting that as far as changes in FreeBSD forbidding long-standing permitted behavior goes, this one was notably very uncontroversial.

It doesn't matter what was technically allowed; the very commit message you linked to says it was by contract disallowed for 31 years:

> The manpage has contained the following verbiage on the matter for just

> under 31 years:

>

> "At least one argument must be present in the array"