Since Trials is both competitive and pinnacle, I feel a Pick/Ban system could help mix things up.
The idea I have for this is simple; Pick/Ban 1 Exotic weapon, 1 Exotic Armour piece and 1 Subclass. So, for example: Ban Vex Mytholclast, Stomp-EE5 and Stormcaller.
Bear in mind I am considering the upcoming changes to light Subclasses as banning a single tree would become outdated by Witch Queen (in the case of void subclasses especially).
It would add an element of unpredictability to Trials, but could force higher end players to change up their load outs (at least in theory).
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It is against the spirit of Trials. Trials was created as a hard core pvp mode where anything (other than cheating) goes.