Ehhh instead of saying we're getting less, just hold your judgement. The arena and trials of osairis could be equal or greater than a raid in terms of awarded gear (Play time varies too. Crota "raid" felt more like a glorified strike vs VoG in terms of completion time) . Only difference is the amount of players going from 6 to 3.
Let's not forget that people assumed the arena was the raid to begin with as well. Not to mention I'm not sure bungie themselves promised a raid on release of HoW. The popular image floating around is to my knowledge a data mined/leaked photo = wasn't confirmed content.
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That's the exact problem man. My clan already has to exclude one or two members from raids. Now it's will be even more.