There's nothing broken about that, it just means your luck is on legendarily bad lows, I have had at least 500 hours involved in Destiny, and I earned 3 Gally's that way. I bought my first Gjallarhorn when Xur sold it that only other time. I've done plenty of Nightfalls, plenty of strikes, Raid's and all. Involvement or hours don't guarantee a drop, just as it always has, you just need to be lucky.