on one hand, has very undesirable effect if not respected (only the long form is printed when the acronym is used for the first time with \ac),
on the other hand, is not mandatory.
It may be useful to make \DeclareAcronym to be disabled after \begin{document} (just a matter of adding \@onlypreamble\DeclareAcronym somewhere in the code).
https://github.com/cgnieder/acro/blob/43e2f3e8d2130818d80884b21e8a0c9fdb9a8c9b/doc/acro-manual.tex#L344
This rule:
\ac
),It may be useful to make
\DeclareAcronym
to be disabled after\begin{document}
(just a matter of adding\@onlypreamble\DeclareAcronym
somewhere in the code).