That electronic WP machine 2nd in the pics does indeed NEED it's tower.
It's got the black pressure boot on the center of the lower arm. This is prior to the internal feed system that didn't come until they put the fine mesh filter on the module.
I've seen a lot of people pull those water transfer towers out of their old WP machines because they "Feel" it's not important.
Granted, these are the same caliber of people who pre-wash their dishes, so they don't notice the diminished results.