I think the controversy of consciousness arises from (and is deeply tied to) the history of Western philosophy and science: the "death of God", matter/spirit and mind/body duality. Something that's not widely acknowledged is how Indian philosophy (Hindu, Buddhist) had significant influence in the course of that history.
A major assumption of the currently dominant worldview is that there's no God, spirit, and even "mind" is questionable. Everything must be explainable as physics, and layers above like mechanics, chemistry, biology. Psychology as a field - in the "West", which is basically a global culture now - is based on that assumption.
The word "consciousness" is so ill-defined and the concept so misunderstood, mainly because it's mixed up with ideas of free will, mind, spirit - the animating principle. It's just the most modern term for categorizing and trying to understand a class of phenomena.
Seeing how "consciousness studies" is widely considered a pseudo-science, I suspect that it's actually related to some critical "flaw" in the fundamentals of the modern worldview, the assumption of a completely physical universe - "physical" meaning consistent with the science of physics.
What's fascinating for me is how quantum mechanics and its philosophical speculations about the role of the observer seems to be causing a paradigm shift, which is taking decades (almost a century) to sink in. We seem to be redefining consciousness as a fundamental property of physics, with some even theorizing that consciousness plays a role in bringing the universe into existence.
As a fan of both Indian philosophy and Western science, I'm greatly enjoying the battle of the ideas (often heated arguments and accusations of "woowoo" pseudo-scientific thinking), the struggle to understand the nature of consciousness deeply and rigorously, and the evolution of science and our worldviews.