(gonna be downvoted to death) Usually Apple die-hard buyers tend to minimize the importance of software/features that are not sported by an i-device or that doesn't work well there. When the 1st iPhone was released, the lack of native apps was a selling point "we use the web standards". When apps were introduced, they were again a selling point (and still are to the present day).

The day Siri will work equal to/better than other competing systems, it will be used as a main reason for which you should buy an Apple device. The day before that, it will still be something that users actually don't want.

EDIT: and to be a bit more clear that I'm serious with this, it actually makes sense. If a feature doesn't work well, you find ways around it. And if you are used to an ecosystem, maybe you don't even know how well another ecosystem works. And finally, if that ecosystem works for you well enough - or that device - you probably really don't care about that missing feature.