Edge of Fate introduces a new type of bow — in short, it has over-penetrating arrows, and deals damage multiple times in a single shot just like Wish Ender.
So, with this development, Wish Ender is the least “Exotic” weapon in the game. The only thing it has going for it now is intrinsic anti-barrier and very weak Truesight. However, even Truesight has more sources coming in Edge of Fate.
Wish Ender needs a rework. And Bungie, don’t give it the stereotypical “Final blows and precision hits with this weapon do X” that you give to all new exotic bows now.
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I'd say Jade Rabbit is actually the least "exotic" because unlike most if not every other exotic weapon, it only has 1 exotic perk and nothing building off of it. But also the fact it's perk is one players intentionally avoid using, effectively making the only thing on JR worth using is it's stats.