I accually don't know, I assumed it did. Prehaps, if the bonus is broken, but not the bonus system, then prehaps you can just turn it into an accuracy boost.
Edit: I also find the Yari Ashigaru cap to be way too low. I often find that I'll take a new castle, and not be able to recruit anything at all. This becomes a big problem when you need at least give the castle a token defence before moving on. Might I suggest AOR Oda Ashigaru units that can be recruited at Owari?