I’d be totally fine with the removal of her unlimited ammo in favor of buffing another part of her kit while in Valk. Like a 5 second reduction to rezz while Valk is active, down to 25 seconds(while valk is active). Or. OR better yet, increased healing per second.
Or something. Mercy rarely uses her pistol, with good reason too. Lore-wise, she hates violence, gameplay-wise. Its nigh useless vs heavier DPS heroes like Soldier, Reaper, Tracer or doomfist for example.