I know this will sound quite stupid, but the fact that SD Terrakion has no counters actually makes it less of a hit in diversity, since you're not going to run counters explicitly to beat Terrakion anyways, you'll just run something that will outrun it and take it down, and that strategy happens to work against everything.
Now, if you happen to force yourself into running certain pokemon to counter a key threat, that threat is actually affecting the way you build your team and potentially limiting your choices on teambuilding. You addressed the problem yourself "nothing outruns RP Genesect", indeed, so you are forced to change your team to deal with it by introducing counters/hard checks.
The argument sounds counter-intuitive, but something that has no counters can easily have less impact in the metagame than something with just a few counters that are entirely needed to deal with the threat.
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