Most of the posts with opinions the state of the meta pre the first (and also second) DLC quickbans were that Shadow Tag was potentially problematic. And that was when Shadow Tag wasn't even on the initial voting list. Indeed there were multiple posts stating that Shadow Tag and Jirachi had a large inflluence of whether other things were broken or not.
Given the large influence of ST, I feel that a quickban was warranted.
At the same time, I do feel a suspect test is warranted. Not because the quickban was a bad move, but to have better assessment of what it's like without other potentially broken influencers like Marshadow (that can strongly shape the metagame alone) for something that has been allowed in DOU since forever. It seems premature to definitely assume it's broken on the basis of a metagame that was 1 week old with these broken influencers without formal testing when it has, again, being allowed since DOU's creation. There was talk of it being banworthy in the Isle of Armor, but this was never tested, and I still feel that a permaban would be premature in view of this.
It also feels like a test to do earlier than later, since the outcome could potentially greatly shape the outcome of other future suspect tests.
This also applied to pre Crown Tundra 8th gen. I do also feel it's somewhat difficult to make discussions like these changes occurred in 8th DLC since we're still adptating. The Volt/Turn option also doesn't convince me since Volt/Turn are still good moves - this isn't greatly making the team worse because of Shadow Tag. Regarding the slower Volt/turn users, I could argue that the power level of this metagame is decreased from 7th gen due to the loss of Z-moves and terrain nerf. This makes it harder for Goth's partner to have the power to grab quick KOs wth ST support or provide more offensive pressure to make up for Goth's lack of offensive pressure.
Personally at this point, I feel like after things settle a bit more, maybe about 2 weeks to a month or so, we could test out some things that got quickbanned and see how they function without Goth being around. Because personally I feel like both Goth and the previously banned Rachi (less of an argument) kinda allowed for way more bullshit than these mons would typically bring forth on their own imo
Just a thought