The consensus (c. 56%) was clearly that cheesecake is neither pie nor cake. Is it pudding? Is it a tart? Is it a flan? Is its own special confection? sandy_williams suggests that present vocabulary is inadequate, and a new term should be coined to account for cheesecake's idiosyncrasies; as a fan of intrepid neologisms, I'm certainly interested in considering options. I'm also relieved to be assured by rjw1 that stew is not pie; that certainly simplifies my article revisions.
I'm also fascinated as to how the discussion revolved around what pie is; which, to be fair, was appropriate to the topic, but left entirely open what this "cake" substance might be, and to what degree it overlaps with "pie".
The importance of the subject of cheesecake can be witnessed by your collective discussion of it inspiring me to write poetry.
Oh, changeling child of baking art,
whose form, recumbent, may prove tart,
if not a pudding, or a pie,
for crumbs, not flakes, beneath it lie.
Perhaps it is a well-done cake,
for duress on the hearth, a bake
of mascarpone, or cream cheese,
to inundate its crumbly lees.
What molten dairy, in abyss
of furnaced baking, made it this?
What crumbled cracker, milled and shred,
proved for it some cold-set bed?
So versatile this recipe,
about which most will disagree,
no single genre, type, or case,
encompassed all your terms embrace.
Perhaps a pie, perhaps a cake,
I'd not on one or t'other stake
my certitude, and so, apart,
the changeling child of baking art.