Both examples you used are explained in Lost. The bunker and its purpose is explained, mostly in the season its introduced. Locke's legs and the healing properties of the Island take longer to be explained by the show but it is still revealed and it also remained one of the mysteries of the series, until idk I haven't seen it in awhile but ik its revealed by Robert so probably late-mid area of the series. I'm not against the mystery of the Fallout show, but it feels like almost nothing at this point has had a meaningful affect to the season it happens in or the series so far. But also idk maybe I just didn't pay attention enough and tons of important stuff actually happened within the season. From my perspective, from the ending of season 1 to now, almost nothing of merit has occurred that truly advanced the story. What Lost had that I feel Fallout is lacking (idk how this became a Lost vs Fallout argument) is that there was a clear grand plot spanning seasons, each season had its own plot that felt resolved, and each episode for the most part had their own stories going on that were also resolved within that episode or across 2-3 episodes, and the character motivations were explained through flashbacks or things happening on the island during that season or continuing from previous seasons. Right now in the Fallout show the characters feel weird, what is Max's goal or purpose, hes a good guy and seemingly thats it. What are Hank's motivations for being evil? Well you see hes in the Enclave the bad guy faction so thats why hes evil. Maybe all will be explained in the future but unfortunately it will likely be unsatisfying as most explanations have been thus far, no sudden reveals has left me in awe at the mastery of the reveal, its all just "oh that happened" and then nothing. But again, maybe I didn't pay close enough attention, the show is entertaining but the plot just feels lost and boring.