One writes the hard-core stuff with no assurance that one will be read, except by a few. And these few cannot be expected to read with much care and almost certainly not with the care the author expended in writing. And of the those who read with care, only a few of them will actually understand what the author is maintaining.
And soon enough, for the vast majority, one's book will languish on a library shelf to gather dust or else end up in a remainder bin.
So why do we write? For the same reason the great philosophers wrote. To get at the truth, to articulate the inchoate, to know one's mind, to realize one's mind.