I recommend keeping all raids relevant by making hard modes only possible with full raid gear pertaining to that raid. And I'd you do hard mode you get weapons that are at the highest quality. For example give the armor perks that are absolutely needed to get hard mode done unless you're team is insanely good. Raids are a lot of fun and why not keep the old content relevant? It makes the game feel much more vast and creates many more options for gear and play styles Later on you could make a play on this by cr[b]eating a raid that requires one member to wear a raid set up of each type