I'm of two minds about congregational singing. Good thing it's not de fide and the church has many cultures. I understand in theory it's a Good Thing. Aware Christians, the community, etc. On the other hand, the community isn't just for the pious. "The Catholic Church: here comes everybody." Most of our people don't sing. Some can't and some shouldn't, so, playing on that old Anglican saying, maybe "none must." Quiet Low Masses (originally for monks' private daily Masses) have been a staple in the parishes for centuries... because ordinary people (and ordinary priests) wanted them.
The article makes the same point Thomas Day made decades ago: much unliturgical music really is a concert, unsingable by average people. The classic Protestant hymns we open and close our Sung Masses with are both orthodox and very singable.