They are on equal footing why would Mercedes give Lewis favors? Lewis is asking just as much what to do as Nico. Remember Monaco just for one.
Kicking tires only wreckers that have no clue do. But anyway it´s seldom a coincidence that two drivers having an equal car and one get more mechanical failures. He do that because he push harder then his material can tolerate. So it´s not just "bad luck"
Now some teams can´t really support two cars and Ferrari is known for prioritizing one car over the other but Mercedes certainly seem to support both drivers equally.
Agreed, for example in 2012 McLaren had a quick car, quick enough to challenge for the title. But it seems that Lewis' reliability problem persist to make the title seemed impossible, a problem that was nonexistent with Jensen's car. Perhaps Lewis doesn't really know how to take care of his car?