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Back when those manuals were printed it was also common for brand new highway tractors to straight into the shop to have the front brakes completely removed before ever hitting the road . Just because it was done 70 years ago doesn't mean it was done right .

Gravity bleeding dosen't compress the small air bubbles that get suspended in the fluid , they will eventually work their way to the wheel cylinder and cause spongy brakes , it is a band-aid method of bleeding breaks. I"ve been certified in heavy truck brakes since june of 1980 . Cutting corner...

They wouldn't put a bleeder on the airpac if bleeding it was unnecessary . Will gravity get most of the air out probably , but cutting corners on a single circut brake system is never a good idea .

If you have air anywhere in the hydraulic line portion of the brake system they will not work properly. This is a single circut brakes system which means any failure means complete loss of brakes and you want to cut corners on bleeding the brakes of a 14,000 pound truck to save a couple dollars...