This is my problem with it, too. Even when Vegeta achieved SS1 off screen in the Android arc it had a sense of gravitas to it, like he was making a grand entrance to show off his new ability. The way he explained training to surpass Goku, reaching his wit's end, and then how he proceeded to absolutely obliterate 19 was the perfect one-two punch to let us know that he was dead serious about his training. SSB comes completely out of nowhere, we don't get more than an off-hand comment about how Goku and Vegeta acheived it, and Vegeta attaining God ki iin the first place is still vague as all hell. The form is achieved with absolutely no punch to it at all, and then to top it off it doesn't do anything special beyond change the color of their hair. Because we didn't see any struggle to obtain it, or its initial transformation, and also because it doesn't unlock any new techniques, it feels completely arbitrary, like they decided to switch up SS and Fourth Form Freeza's colors and call it a day. I thought Super's adaptation of Revival of F might elaborate on the form, but it didn't. All it did was