Rikus wrote
Too much pressure during gluing means you're starving the joint of glue, which could lead to catastrophe given the amount of tension on that joint.
Imho this would depend on the type of glue and materials involved. If you're hide gluing an Ebony bridge onto a lacquered unsanded top, it's going to be more critical since there is no movement of the glue into any pores, agreed. If you are more generally gluing two porous woods (say, Mahogany and Alder) with thin epoxy resin, you can never put enough pressure unless squashing the wood itself.
I would offer more explanations for preferring the vacuum method: it is easy if you have the equipment, gives very repeatable results and uniform pressure (deep throat clamps are a pain to set properly and there's only so many of 'em fitting into the soundhole onto the bridge) and does not mar the surface.
