As everyone here knew about my secrets, having the shields to prevent anyone from simply viewing them was important. Without extensive training and practice, Occlumency wouldn’t necessarily stop someone from brute forcing their way through. There was very little that could stop that unless they went through special rituals. But as far as I could tell, spellbinders were no longer a thing and I was possibly the only person who knew a few of their practices. While I don’t regret going through the mind shield ritual that spellbinders undergo, I would never want anyone else.