I’ve never completed the main quest line in any Elder Scrolls game.

The majority of my playtime in Oblivion was spent breaking into NPC houses and stealing their shit. I’d stalk targets based on who had the most valuables in their pockets when I’d see them wandering in the cities. I basically played the game as a stealing simulator, only ever completing the Thieves guild quest line and the Dark Brotherhood line when I wanted to be add some murder to my thieving.

I don’t think this is uncommon with the Elder Scrolls games.