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The only thing you've truly lost from the dexcull is the privilege of tediously transferring 500-600 mons to Galar. You'd have to be a massive brainlet to think that if SnS had the national dex it would've meant we'd be able to catch everything. There'd still only be the 400 mons available in the wild and knowing GF's track record that'd lock the ability to transfer old pokemon behind postgame anyway.
Your bros all still exist in better games. Either replay those and stop complaining or suck it up, pick up SnS, and make new bros.