Same thing happened with Aeronautica Imperialis.
"That Company" has decades long history of abandoning anything not in their two core games. It should be expected.
Yeah man i know… After each new Codex Sortie in 40k you can basically throw half of your army away and get new Stuff. They call it "Marketing" i guess lol
You know..they wouldn't do that if people said Hell no we are not throwing away half our army and refused to buy the new stuff.