One should consider the term reductionism in a differentiated way. Those who cannot imagine the mundane physiological activity producing consciousness, or seek some intermediate step, are quick to speak of reductionism. Such nonsensical themes as the serious problem of consciousness then arise from the rejection of it.
Now what is reductionism? This is legitimate in physics, because there you can always (at least mentally) reduce complexities to their individual parts.
Very different from all living things. This can only be explained as a structure, so from the outset it is not just more than the sum of its parts, it is something completely different from the sum. Central nervous systems are very different from protein synthesis. The term strong emergence is actually still too weak for this.
Emergence is not only a higher quantity, complexity or sophistication, but it brings new principles into play.
However, life is already emergent insofar as it can only be called life as a combination of individual parts and functions as such.
However, physics has no suitable categories for life that could explain the movement, change and development of a self-active system with its own will.
Here people like to ask whether physics should not have any justification in relation to life. Of course it has, but not by being able to explain the structure called life, but by exploring the relationships between the individual parts (biophysics).
That is, the question of how physiology creates consciousness is not a physical one.
And the question of how a single individual being feels, certainly not.