The not-so-secret message in new YW titles--LDS women are helpers, not leaders.
TL;DR--New YW titles all connote helping, while longstanding YM titles all connote leading. This reflects the LDS church's enduring commitment to patriarchal gender roles.
LDS youth programs are intended to prepare young Mormons to fill religious gender roles in their future families and congregations.
Mormon boys receive escalating titles that each come with increases in practical power and authority in their community. The titles themselves communicate leadership innately:
"Deacon"--traditionally a figure of moderate authority in Protestant churches.
"Teacher"--in both religious and secular situations, a teacher is usually the most educated/qualified person in the room. A leader and authority figure to their students.
"Priest"--in religious contexts, a person who represents/speaks for God--the ultimate authority and leader of the universe. Exercises authority over worshippers in various ways.
The connotation of these titles is extremely clear--LDS boys are being groomed to become leaders in their communities.
Compare this with the denotation/connotation of the new Young Women's titles:
"Builders of Faith"--builder has no connotation of leadership in English. For me, it brings to mind literal construction of buildings. In this context, the authority figure is an architect or a foreman. Builders help build the building, but they don't lead.
"Messengers of Hope"--messengers definitionally have no authority of their own, they operate only to transfer the message of the leader who sent them. They help the sender, but they don't author the message. Ironically, "apostle" in religious contexts has the connotation of both a helper and a leader, but I think we all know why LDS leadership would refuse to call a group of young women "apostles" (despite the fact that Paul mentions a woman apostle in the NT.)
"Gatherers of Light"--This one has absolutely no connotation of authority or leadership. In fact, people are rarely labelled as "gatherers" anywhere in American English, so it's hard to even pin down its connotation, but to me it's got a "helper" vibe.
Each YW title easily qualifies as a helper, but none carries the clear meaning of leader.
I think we all know why.