Well, I guess I’m going to be the choir director out.
I drives me bonkers when our choir sings just the same catchy tunes and not the psalm of the day. The Psalms of the day go beautifully with the other readings. You can get the whole set in Respond and Acclaim. Most all the Psalms are in Gather. A person attending Mass on a regular basis “catches on” pretty readily.
Our previous choir director used the same seasonal song/psalm for every week in the Easter season every year. Sure the congregation belts it out. It’s pretty much the only one they know.
I’m now in the position of DRE in the current parish. We spend time explain to the all ages in Catechesis that it’s admirable to read the readings for the Mass in advance to reflect, and possibly gleam more from the homily. And when we get to church, it’s something totally different for the psalms. So the the question: Why does it matter? Why doesn’t the priest read whatever he wants? (these are kids, you know…they pick up on this stuff).
For my part, I believe it speaks more to just having a choice. When you give people options, they run with them. I’m not saying you shouldn’t EVER change them…there are some good reasons, but every single week? Come on. Drives me nuts.
No one ever had to ask me why, because I never messed with them. Our past 2 Directors here? Take out the boxing gloves. It’s their choice, and they won’t discuss it, and the pastor wants no part of it. Just get it done.
I believe a really good choir can learn, sing, and present the psalm with the congregation following nicely…but it takes regular rehearsals and prioritization. We did it for 16 years. No problem.
Now they just reprint the songsheets from last year and change the date. It’s embarrassing for the parish when they forget to change the date.

But it’s permitted…so…