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Essay incoming. Thanos snapping half of the competitive roster out of existence isn't going make the meta any better. I learned this a long time ago, and I work in this field, btw.
Imagine, for a moment, if you could quantify the exact strength of every Pokemon, and organize them in order from strongest to weakest. I know that this isn't how competitive Pokemon actually works, but bear with me for a moment. Now we don't know how big of a factor competitive viability was in their decision making to keep or remove specific Pokemon, so I'm just going to take their word at face value and assume that they're picking Pokemon based on how well they fit into Galar. We also don't know what % of Pokemon are staying VS getting snapped, but that's not as important for the point I'm trying to make. So imagine if they remove an arbitrary number, at random, from the competitive scene. All that's going to do is making the remaining members of the club all the more common.
After all, a ton of alternatives for your competitive team just got swept off the table. All that this is going to do is make the same Pokemon you're used to seeing all the more common. And for a format like Smogon singles, where the tiers are decided by percentiles and competitive usage, the same problems will still exist. Some pokemon will always be better than others, and as such, competitive oriented players will use them more often. As the meta becomes more and more solved, the word gets out that X Pokemon is strong, and then everyone will begin using that Pokemon. The same thing will happen with Sword/Shield. There's no reason for it not to. Competitive balance is a bullshit excuse because there is no such thing as a perfectly balanced game like this, and that's just a fact of life. Some Pokemon will ALWAYS be stronger than others, and there is simply no way around that. The only way around that would be to cut the roster down to 3 and have a game of rock paper scissors.