I stopped watching Lost over a year ago for many of the reasons articulated in the rant linked below. Far as I can tell, there are no spoilers for the finale; it’s more of a general look at how the show’s writers don’t respect their own internal rules and disown association with SF when convenient.
I personally remember the time back in the first few seasons when they claimed all the island’s mysteries had logical, non-magical explanations. That was the hook. A few bizarre situations amidst the very real drama of being stranded on a desert island. The impossibility of reconciliation was an addictive drug, and like all drugs: a lie. Keeping an audience for six seasons demanded a ramping up of mysteries, each new one another obstacle between the current episode and a satisfying conclusion.
Link [Rules for Anchorites]