Even in Dhammapada, the tranquil detachment is only means to an end. There is a Buddhist saying: how is desire for liberation different from other desires of which we should have none? In no way, goes the answer, but in order to jump as high as possible, you must first crouch. Nowhere does Dhammapada say that nirvana is tranquil detachment or void. Even the extinguishing of desires is just an image that to an ignorant person seems like a zombie-like state. That's the usual error of common Buddhists -- "everything is empty" yet they have no clue what they talk about. What’s empty are things that are devoid of intrinsic, conceptual, value. And that's not a problem with Buddhism per-se (or the original ideas of whoever Buddha was) but with practitioners who follow said path, but don't go the full distance (the same is true for the whole Abrahamic tradition as well as Hinduism, but also Taoism).

When it comes to free will, of course there is free will. We always choose totally freely, even though options are always limited and causal effects (outcomes) given.

As for personhood -- you ignore the fact that consciousness is without attributes and own to (at least) all mammals and birds. That makes consciousness identical across the board, inhuman, and the question is (though for me it's a moot point) how can trillions of different brains produce a phenomenon identical to a T? It is also closely tied to the question what is outside of space-time? So, you are dealing with details not seeing the "big picture."