Let's be honest. A lot of people dropped the Menagerie after the chest "fix". Understandable going in the Menagerie for what feels like 20+ min for one guns feels weak. It really needs more loot. But I'm not saying add three chests at the end(although that would be great). Instead let's look at the Verdant Forest. For those who forgot you got more chests the more bosses you kill at the end. Now killing more bosses doesn't fit with how the Menagerie works. But the Verdant Forest rewarded you by doing the activity better. Which is very much rewarding.