Simply because the game was not finished, massive amounts of bugs in side quest, infinite loading screens on cryodiil and else where that requires load able instance.
Been waiting in a que now for 2 hrs due to motes in moonlight bugg that means cant progress to next zone. Seriously there's like 30 peeps here all waiting around, so no I don't regret cancelling my sub a week ago.
Don't want to level up power bashing, dungeons thro grip finder pop once in bluesy so no xp there either and xp in cryodil laughable if I can get in due to lockin.
Total joke, hey about releasing a product that's somewhere near completion before you take our money.