You cannot even launch trials unless you are at least 1520, so there is no way you should be seeing people less than that unless they switch gear after launching it.
That said, what they should do is cap players to 1560 regardless of how they get there, just like they cap you in GMs. That way those who are not blessed by RNG to get to the pinnacle cap can use some artifact power levels to make up the difference.
English
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How power works in trials is it removes your seasonal artifact power and removes and stops giving benefits after 1550. So anything lower then 1550 you are doing less damage and taking more damage
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How about all these asian servers that people played Hakke win trade on?