I'll wait until after I've watched 11 to judge the Asami plot twist. However I have a feeling it may be the type of plot twist that works better on a re-watch where having advanced information makes things more noticeable than before.
In any case plot twists are a tricky beast in terms of balance. Don't drop enough hints and people will gripe it came out of nowhere. Drop too many and some will rant about how they saw it coming a mile way. Then there is the problem of once you reveal certain plot twists there's no turning back which often causes the writers to be so hesitant that the plot twist is in a sense revealed too late.