here's a question:
How do you know that old smartlinks don't just provide the +2 acc bonus?
Things have changed a LOT since the rules of 3e. New attributes, new mechanics, Edge, limits, and everything else.
It's entirely possible that, that is all they ever did back in the good ol' days. (since there wasn't limits, or edge, and fewer attributes, etc)
So now in the "future" (of the future set game) they not only provide the +2 acc bonus, but if they are wireless, they actually help you shoot better too (for the +2 DP).
and really, it doesn't matter. The smartlink in the book is the only with we have to use. So use it.
And:
All of you seem to miss this little piece of info (EVERYTIME!)
page 27 SaSS
Several of the qualities,
metamagic techniques, spells, and weapon modifications
listed here are not detailed in the Shadowrun, Fifth Edition
core rulebook. Supplemental rulebooks such as Run Faster
and Street Grimoire, which will provide more details about
these items, are coming soon. Where necessary, though,
interim rules are presented here. Any rules presented here
will be superseded by later supplemental rulebooks.
which I take to mean as: "we are not too sure yet what we are doing, so nothing listed here counts if its NOT in a core book. (SaSS is an
ENHANCED FICTION after all, and not a rules book, or a gear book... it's a story book)