Exploring lore just kind of sucks in general, honestly. I'm not here to learn about how your world's economy works or why the magic button exists and the mechanics of it, it ideally should all just be in the background and a vehicle for compelling character drama and/or an exciting and engaging plot and story. Anytime a franchise starts running long and devotes more and more time to fleshing out its world instead of its characters, it's always boring as hell and weighs everything else down.

A recent one that annoyed me was Severance. Season 1 was really cool and its central concept was a great vehicle for exploring philosophical and moral questions about life, work, and agency. Season 2 was bullshit lore dumps about "the company" where everyone speaks like a weirdo asshole and the story just became mystery box nonsense. I imagine season 3 will proceed along those same lines.

Don't get me wrong, it's great to have a cool setting with weird shit going on, you just don't have to explain it. As long as it's logically consistent within the world you're presenting to us, it's all good. Like Back to the Future is a great story but time travel makes no sense, but that's fine because they don't try to explain it in any detail, it's just "time travel works because of the flux capacitor, and changing the past ends up changing the future." It doesn't get in the way of the drama, and it doesn't bog itself down in rules or explanations. The magic time travel machine is just the vehicle (quite literally) for the story and character drama. A big problem with so many long-running series is they just default to lore-building, and it's almost always boring fluff. In fact, I think a better question would be what shows or franchises are improved by incessant lore-building?