That is such a cop out. No, you can't simply MAGIC away everything and expect people to be ok with that. The first few seasons were absolutely not about magic. They were about mysterious and supernatural things, sometimes, but the show was very much rooted in reality. Our reality. Everything that is happening on the island is supposed to be happening in our world. This world. The one where the red sox won the World Series.
It's not like a show such as Legend of the Seeker which is full of magic but that stuff is happening on a completely different world/reality.
And yes, the show got crazier and crazier as time went on, but even time travel could have a scientific explanation. It's a little bit of a stretch. But at least they threw in a physicist so that there would at least be a semblance of realism to that storyline.
For a long time, people assumed that the smoke monster was some sort of mechanical mechanism, due in part by the sound effects and also cause Rousseau once said that the smoke monster was the Island's security system. Ben was also able to "summon" the smoke monster at one point. One of the most prevailing theories was that the smoke monster consisted of nanobots. Science fiction? Definitely, but is it something audiences could believe? Sure.
From Damon Lindelof: "Ohh, nanobots. I don't know how many times you can go on record and say that the Smoke Monster is NOT made up of nanobots before you stop getting asked that question".
The smoke monster kept evolving and evolving until it got to the point where it turned out to be MIB. Ook, that really doesn't make sense. But hey, let's go with it, maybe there's some sort of explanation that makes sense?
But the explanation is basically, dude floats down tunnel of golden light, turns into smoke monster.
So initially we have a creature people believe may be mechanical, or nanobots, or somehow connected with the magnetic forces of the island. What we're eventually served up: magical golden tunnel light.
Just cause the past few seasons have turned the show batcrazy doesn't mean you can point at the lamest "explanation" so far and be like, WHAT DO YOU EXPECT, WE STOPPED MAKING SENSE A LONG TIME AGO!
The show, the network, the writers and the creators all claimed to have answers. It's not like this show ever went around claiming that we'd never find out anything and to please lower our expectations. They hyped up these reveals and these answers for years. They pre-determined the year to end the show (sometime most shows never do!) because they claimed that they wanted to finally give the fans some answers and give Lost a proper ending. None of that is happening. So yeah, people are gonna be pissed.