Have almost 2000 hours in the game, but they lost me when they went all-in into open world style gameplay and killed raids.

Veeeeeeery interesting! I haven't kept up on Warframe, but this looks to me like a big nod to Dark Sector, the studio's first attempt at a "Warframe" style game that ended up getting scoped down into a weird single-player game. But, most of the design language and ideas of Warframe came from Dark Sector first. I wonder if this is them finally making some explicit in-universe connections to the two games, as opposed to spiritual nods and references?

Oh, and anyone who hasn't seen it, NoClip's documentary series on Warframe is a great watch, even if you have no interest in the game itself: https://www.youtube.com/playlist?list=PL-THgg8QnvU7Weo1mCM9H2AXljC7UrDm8