True, that's a good explanation.
The arm mounts where secondary anyway, and never served a really dynamic purpose except for the Gelgoog Jeager, which was equipped with Vulcan to keep enemies at bay. The vents I believe where more for mobility purposes, and in the Gelgoog Refined (RF) from F-90, they are rocket launchers.
But that's little things, your design is still outstanding, and I think it's really nice and original. As are all of your works! Love your style.