Time saved isnt pay to win lol.
Somebody boosting impacts your game none. You wont lose a raid spot to a booster because they boosted. You wont be disadvantaged at all by someone who boosted. The only thing you’ll be is sensitive to the fact they didn’t have to level 1-58 like you did.
You literally will not be able to identify someone who boosted unless you noticed their gear immediately after they boosted.