Originally Posted by
Cheze
1) expect raiders to flask/food/pot/rune on mythic encounters. Yes it gets expensive, but it's also what puts marginal attempts over the top.
2) 'Perfect execution' is a silly metric; if your folks gear is acceptable and few or none of them are climbing out of the grey percentiles, their execution isn't perfect. Moving out of poison/bugs isn't sufficient if you can't do acceptable DPS/healing at the same time. It's frankly kinda bizarre that you're even approaching nythendra's enrage, since it isn't a tight one at all.
If you don't want to either enforce consumables, replace underperformers or invest serious time in figuring out how all your DPS can improve individually, you may just have to continue to farm heroic until you get more gear.