Found something that describes how I feel towards SSB and SSJ4 as forms pretty well.
"By the way, I had something I wanted talk about. Mainly, the difference between Super Saiyan 4 and Super Saiyan God/Blue. Mainly, on what both versions could symbolize for Saiyan's and Ki in general.
Super Saiyan 4 seems to be based around what the perfect Saiyan would be. The tail needing to be attatched, the fur coat that appears, the process of moving from Great Ape to SS4, all seem focused on taking everything standard about a Saiyan, and pushing it to the max. In fact, it could be seen as the opposite of regular Super Saiyan forms. Each Super Saiyan form boost ki, sure, but they never seemed to have much to do with the Great Ape form at all. While SS4 could have fit in very well in Dragonball as a upgrade to the Ape form. I'd say that if Super Saiyan didn't exist, SS4 would instead be call Perfected Great Ape.
Super Saiyan God/Blue on the other hand, is an elevation of ki as well, but on another level. While Super Saiyan 4 could be seen as a Saiyan brought up to the purest level of their animalistic upbringing, the God forms are explicitly the next level of Ki in general. It can be used by multiple species of creatures, is far more potent and powerful, and turns even Goku and Vegeta's base forms into something epic. Unlike SS4, which massively changes appearance, Super Saiyan God's changed were subtler, with SSBlue being a color change at best. The physical doesn't matter as much as the ki abilities.
I don't know, I just find it interesting how different SS4 and SSB are, while sharing so many similarities. Both are elevations of things we loved in the old school stuff, and both make a certain kind of sense. One is the Great Ape's successor, the other is a evolution to all the other forms and power ups, even bringing back Kaio-Ken.
Just a random thought."