Tbh there are only 6 conquest missions that have avant garde, and a pvp game mode that require using featured gear only. Everything else is based on customization choices for reward tiering, and avant garde is an option that honestly isn't required to meet the B+ Tier threshold to get A rewards. Banes, locked loadout, and a few modifiers can get the B+ Hard variant to meet the A ranking for solo, or pinnacle. Try to find the right formula for whatever character you are playing and a build to match surges for faster runs. I only use one surge either void or strand for hunter, arc for warlock and titan, solar warlock, this makes runs go by smoothly in my experience with it this far.