I'm not sure if these earth weapons will change much. Right now earth doesn't have many attackers that can take advantage of stamina very well. They need an attacker that's more suited for it since there are plenty of good earth healers/buffers to help keep stamina going.
Siegfried, Halle and Nemone are the only options earth has for that role. Siegfried is always just a nice all-round pick. Halle and Nemone just because they don't want to get hit anyway. The problem being that Halle already caps with an MLB sword grid so building an entirely new grid isn't really necessary. I suppose you could also just use Sarasa but never press her Ground Zero.
Just like last year, i'm not a fan of where this is going. They seem to be introducing weapons and characters that don't fit the current playstyle of a lot of elements. There were some anomalies that did this like dark Cag last year but we've been bombarded with those things as of late. Things like pushing Stamina on wind, the element where half the characters want to get hit or the "get a random buff" and "Something happens when the enemy has full diamonds"-mechanics earth got recently.