This is a roleplaying game.
Therefore, the removal of the open lock spell was an awful idea.
It completely subverts role-playing if you can just throw a spell at it without a dedicated skill. Especially with regenerating magicka, there's never any consequences or risk of failure associated with trying. A mage shouldn't be better at dealing with locks than a dedicated thief, but that's what an Open Lock spell accomplishes. Infinite no-risk no-cost unlocks for mages, whereas a thief needs to manage lockpicks and carefully assess if a lock is worth attempting. That's completely backwards. Even if a mage has a free ride with being able to pick locks without the requisite skill because he has a spell, they should never be better at it than someone dedicated in the skill of picking lock. It's like being good at blocking without having to touch the Block skill, and being better at it than someone who did invest in a block skill.
Your ability to get through locks should be affected by your lockpicking/security skill. Perhaps bashing and open lock spells could work that way... the less you know about locks, the more risk there is of damaging the contents of a chest, of tripping traps, making people go hostile, and of generally alerting enemies to your presence, regardless of your weapon or alteration skill (in fact, the more weapon or alteration skill you have, the more risk there is of damaging contents or alerting people, if you don't have a lockpicking skill to match). If you want to use a spell to unlock a lock, or strength to safely and efficiently break open a lock, you should still need to know how locks work.