You misread my post. I said that lock spells and lock bashing would make the lockpicking tree even more redundant.
Yes, but that is not true.
Its better to have several paths to a goal than just one.
Not being able to use open spells forces my mage to use lockpicks.
Conversely, having open spells and lockpicks does not force a thief to put down his picks.
Best system to date was in Daggerfall, where rogues used their lockpicking skill, mages had open spells and warriors could bash a lock.
One path for each archetype, and nothing was 'redundant'. (Whatever that means in a single player RPG.)