I'm well aware of the lack of a need for focus sash. That does not change the fact that focus sash is or was its best set and is now far less effective. The other set ranked at A on the VR setlist is scarf. The only stuff scarf traps that sash didn't are Mega beedrill (garbage mon), scarf excadrill (mediocre and already trapped by sash so long as iron head doesn't flinch), the greninjas (oh wait no it can't OHKO them anyway and is OHKOd in return), and Koko (basically the only good thing it gets with this set that it doesn't with the other). In return, it no longer effectively traps Megagross, Megawile, Megacham (lacking priority, and it loses to Priority no matter what), Hoopa, Magearna, Alowak (so long as it has some defense or HP investment), Chansey, Lele, and every other mon already slower than it that could survive a hit. Basically scarf isn't that great. Meanwhile, Band is B+ and Groundium isn't even ranked. Sure, it picks up OHKOs on some important mons like Medicham and Metagross, but it still falls prey to any priority or just any mons faster than it. Mawile, Gren, Koko, scarfers, etc all don't give a shit about it anymore.You don't need a sash on Dugtrio is the thing you're not getting. As robopoke said Z-Quake or scarf is a much better options outside of stall builds that give much more utility than sash and people are starting to use Sub Zmove on stall to get around Mawile and revenge a wider range of breakers.
It should still stay A, being able to trap or revenge 70% of the tier, and is a wonderful support option on many team builds.
You say it traps 70% of the tier. With its sash down or with groundium, I count roughly a third (definitely less than half) of the mons in OU trapped by it, and something awful like 2 of the BL mons trapped by it.
It's a good trapper with uses, but it seems far more on par with magnezone now and far less useful on everything but stall, which means it fits well with Mega Sableye in A-.
StraightEdgeNexus Your replay is against a team with 5 mons weak to Mega Gyarados's STAB moves. Of course it was going to sweep as soon as Fini was down.