As the title says, seems like this change was either on purpose, or something went wrong, but currently the highest stat you can get for a Lv70 rare item, is 24.
This is also the same for drops.
So far what I've noticed :
- Lv70 legendary subweapon max hitrate is 235
- Lv70 legendary armors is either 29 or 30, i'd say probably 30.
- Lv70 rare never goes above 24 (con,foc,dex,sol,str,eng).
- Lv60 rare max stat is 21.
However, some people claim (and showed me) of 24-26% speed weapon drops.
Long story short, don't go around trying to craft 28 con gear, it won't work.