Sparky: We are in full agreement, I hope this opinion is not restricted to only us.
I would prefer to have a light fixture constructed in such a manner, that heat would be prevented from commuting to the outlet box and wiring. I am sure I can do this, and others are much more intelligent than I.
As you have stated, this appears like a liability disclaimer to prevent litigation.
In my service work days, I had a lot of creamated wire problems in fixture outlets.
This increased after the banning of asbestos.
Many were injured and had there lives shortened by asbestos exposure. This is a documented fact. How many fatalities and injuries are a result of fires in these overheated outlet boxes, that asbestos insulation would have prevented? This, we will never know.