I hadn't thought about it much before you mentioned it, but I came to Oblivion from a game where you couldn't fall off a bridge, because there were invisible edges to the "walkable" parts of the landscape.
It took me quite a time before I discovered that you could swim in the water (previous games had boundaries at all shorelines) or walk down mountainsides that were too steep to climb back up. But then I spent a while drowning, and falling too far if I ran or jumped injudiciously. It's a completely different style of play, and I can understand people having preferences for one or the other.
With one exception (a game world that was topologically a torus, where going due north/south looped you around, and the same east/west) there aren't any that don't have a boundary somewhere. Even with the space games, the edge of the galaxy often was a logical boundary, as you'd stop going anywhere, and turning back instantly re-entered "known space".
But Oblivion's probably the only game where, on a clear day, you can see the opposite edge of the world. Maybe that's why I've added Valenwood and Elsweyr to mine! I don't like fog, which seems to be the standard view limiter used. The lack of it is one of Oblivion's plus points, IMHO.
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Mods for The Elder Scrolls single-player games, and I play ESO.
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