I guess growing up with a sheet load of engineers in family, they would talk about things from ea of there aspects. Some like those designing in the aeronautics/Boeing front, were dealing with size specs in the +/- 2/10,000 of an inch! In my world of landscaping, the survey engineer is dealing with specs of +/- 1/10 of a foot! A pretty BIG difference in how far off you can be measuring 100' of distance, or elevation. But from that airplane spec, needs to be much smaller.
Or my bobcat has a load rating of 1700 lbs. Or half of the tip load! Reality is, it can lift up wards of 3400 lbs. If the front is slightly down, the amount I can lift is less. I've lifted more if the rear end is lower than the front.
I understand the conservative part. In some senses I am more conservative than many on here, altho it looks as if I am a flagrant abuser of ratings. One needs to know the correct way to look at ratings, yes from a true rating standpoint, then from a can it be overloaded, to where, what is the how I can etc. No different than the hitch I put on my 96 GM CC. I knew I was pulling trailers upwards of 10K and 1200 lbs dw hitch. I had torque lift build my a hitch capable of doing that. They put appropriate stickers on the hitch! Frame is was plenty capable of handling the load!
Marty