yes - limiting consciousness to the human brain has many drawbacks re explanations - such as why people reporting near-death (and other alternate experiences) have very similar things to say. If brains are that individual, why do consciousnesses experience such similar events?
The explanation brains are powerful enough not only to create consciousness but to create alternative experiences consciousnesses can have, means that one can argue that brains are thus powerful enough to create our non-alternative reality which means that we are left wondering what exactly "brains" really are - not the fatty organs inside skulls - because "brains" which create reality can also create ways of hiding themselves from our awareness behind things it creates in order to do so.
Essentially the idea that brains create anything speaks of a mindfulness which purposefully tricks the consciousness it created into believing it is the creation of something way more powerful and creative than consciousness itself.
Moreover, the actual 'tricking' is done by individual consciousnesses against other individual consciousnesses, be these believers in supernaturalism or materialism.