Some editors have decided that reducing the number of open submissions by clearing these via rejections is more important than documenting their existence on site.
...which I definitively consider damaging and not beneficial. What does it cost to have it sitting there as a submission? It still adds value.
We shouldn't be one sided about this, as there is more than one way to see things. A page with 25 processed and 2 open submissions suggests a dynamic, active database while 25 processed and 20 opens could suggest an abandoned website to a new user. I acknowledge and respect those concerns, but agree that they don't outweigh the value added you have noted.