How could you get bored of any TES game??
Cause they become repetitive?
Go down another draughr dungeon to meet yet more draughr deathlords which take forever to kill and aren't even a challenge anymore only to get crap loot as you've already learned most enchantments, have tons of soul gems and don't need money.
Do the civil war campaign and bombrush forts 60% of the story.
Meet yet more Forsworn or Falmer which never get better gear and have nothing worthwhile on them and just feel like annoying chores to kill.
Go down Dwemer ruins that are linear, stale, predictable and unrewarding.
Do quests in which you have to retrive/kill/explore X and return to said quest giver.
How could this not become boring?
It's repetitive as hell.
Everything leads to dungeon crawling, and dungeons can take up to hours to complete if you want to fully explore them.
And as the difficulty setting svcks you become either too powerful or the enemies become damage sponges.
How is any of this fun?