A big part of it is they realized the mistake they made by creating elemental primaries. If you look in the armory for year 2 weapons there is only one elemental primary, the arc exotic Zhalo Supercell. Even the new Trials of Osiris Adept weapons are kinetic with a simple difference of drop damage (280 vs 310). But I do wish the first two raids weren't completely worthless now... only reason to keep doing them is grimoire