Having played WE last 3 months in cities, I have thought of this at some points, having a Challenge in your buffhead for 60mins is somewhat of headache, especially since it stacks with Bellows and if there any is decent tank in enemy team, they will be permasnaring permadebuffing permachallenging me while I somehow try hunt healers whenever I'm not spending 5 sec floating in air due to kotb megapunt or waiting 6s at sidelines watching RP stagger decay over time.
So yeah, at least having a mechanic for Clearing challenge would be nice, but somehow I really doubt the devs want to aid WE/WHs in cities, since it risks them becoming better elsewhere as well.
My personal idea to counter the Challenge would have been to add an extra rule to the core finisher user, "using full 5 stack Finisher clears Challenge effects" but might be too much, or maybe after using Stealth opener you get the AP reduction self buff, during which you could gain immunity from "all outgoing" DMG reductions (yes, both Challenge and DB).
Third option being add extra effect to Feinted Positioning that does same as above "clears all outgoing dmg reduction debuffs", which is at 60s CD normally but I guess you could waste tactic to lower it down to 20s (might as well mirror said tactic to WH because why not).
Idk, it just feels so tiresome, you are supposed to be the "high risk high reward" low armor high crit (lol, WE BIS at 42mcrit vs Mara over +60) class choice, but as it is now, 1-2 good tanks in enemy team and you are going around scratching people.