Okay- My turn to say something. The National Electric Code is the Code I was hired to enforce. Nothing in that Code has me asking the electrician to install any additional wires or jack chain or aircraft cable. If the ceiling can't support the lay-in or recessed fixtures it is a structural issue and the ceiling guy needs to respond. When is the last time you installed additional wires and it did not distort the ceiling and now the ceiling guy is in your face. If it is specified in the plans about additional support I guess there should be some team work between the electrician and the ceiling installer. All I look for is that the fixture is secured to the grid work.
Okay, tell me I'm wrong.