I think the answer may be that phenomenology has produced so disappointingly little. In a non-philosophical sense phenomenology is defined as the preliminary classification of phenomena in an enquiry. So one might for example regard it as a piece of phenomenology in this non-philosophical sense to say that a white surface seen through a light blue filter looks stone-cold white, and not blue at all, as per the philosophical folklore. The question the analytic philosophers ask themselves, I suspect, or at least this one does, is whether there is something as solid and productive that can be gleaned from phenomenology in the philosophical sense, in addition to its methodological meanderings.
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Why is so little phenomenology taught and researched in North American philosophy departments? Because it studies the essence of consciousness is it too continental for your analytic minds? Why must philosophy be categorized so strictly?