A church building, as a House of God, should be built with the idea that when someone enters the Church they immediately sense the majesty of God and that the people who built the Church wanted that. We should always give God our best, not something less than that.
A traditional-style church is usually one built more than 60 years ago. It will have full-size statues of Our Lord and the saints. It will have stained glass windows with real-life depictions of sacred themes, It may still have an altar railing. It will have a large, impressive altar made of marble. The sanctuary will have statues and other ornamentation that accents the altar. The common reaction when someone enters such a church is how beautiful the church is. They immediately sense how important this particular building is for worshiping God.
On the other hand, most churches built since the mid-1960’s have done away with the traditional items mentioned in the previous paragraph. As a result, many people see a bare building, one in which few people upon entering think of God, but rather just a simple building to go to for Mass. Our children, especially, feel that. Yes, the Lord is present in the fullness of being in the tabernacle, located somewhere in the church, but the stark looking Church building is not worthy of being considered as giving God our best.
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To back up my point, you will see people taking pictures inside a traditional church. You don’t see folks rushing to get their cameras out when inside a modern-style church.**
So in the same way, the LA Cathedral, even if it cost a ton of money to build, is designed such that a majority of people entering it do not sense the majesty of God, but instead see a confusing modernistic architecture, then that is not good.