Binocular size is a constant source of discussion. I agree with Temmie in his above post that for many hands, a 30-32 mm binocular is pretty small, often too small to be completely comfortable. However there is the other side to the coin, in that some larger binoculars will be too large for some hands. Hence it is a matter of personal preference, never to be resolved past the preference of the individual user.
However I think there is something called specification anxiety that plays a major role here. People get curious about a particular binocular. The first thing is to go to the spec sheet to discern some particulars. OK, 32 oz, that is too heavy, the fov is not wide enough, the eye relief is not right, this extends to the entire content of the specifications. Conventional wisdom, which often is more conventional than wise, comes into play too. That tells us there will always be more brightness to be had in a larger aperture. Back in time that was a lot more applicable in field use than it is today. One of today's good 30-32 mm binoculars gives up little to a 42 mm, even in low light. yes, the 42 will always have more light, but personal need dictates the choice.
Weight and size are in play here too. I once had a Leupold Gold Ring 8x42. Biggest mistake I ever made (optically anyway) was to sell it. Yes the spec sheet said it was heavy and people complained to the heavens about the weight. However the vast majority of the complaints came from people reading the spec sheet, very few came from people who actually owned and used one. Same can be said for the Maven B2 and the Zeiss SF. Boy those are just too big. Not unless you suffer from some physical infirmity. If you actually use one, the weight is a non issue. Balance and a good harness can be amazing weight cancelers. Good glass and a state of the art 32 mm will allay a lot of low light issues.
Personally, like Lee, I have never wished either my Leupold or my Maven were either a little lighter, or a bit different size. I have some 32 mm binoculars I do sometimes wish were a little longer, rarely if ever do I lament the smaller aperture.