So I've had a thought:
What If we've had an option to give up rewards?

I'm thinking about having a tickbox to just give up on rewards for current-savage content. This is useful for everyone having a static raid group, who wants to practice a fight without ruining everyone elses loot.
If you receive the loot the system behaves just as it is now, meaning you only get 1 out of 2 chests for 7/8 and so on.
This would enable me and probably many others to practice raid fights without being afraid of "accidentally killing the boss".