Normally, I'd say i completely disagree to the idea of mounts. Don't get me wrong, mounts would be really cool, and I'd love to be riding around on a Spider, or even a Soldier ant. The problem with that though, is that this game seems to be trying to keep the insects as accurate to real life as possible. And something you need to know about bugs in real life is, that they are not tamable at all. Their brains just don't work that way. They are wired completely differently from birds or mammals or other social creatures. They simply cannot make the association of pet/master or make that child/parent imprinting at birth like some larger animals do. They are driven by instinct alone.
I could keep going on about this to drive the point home even more, but there is one big counterpoint to this that could render my argument invalid, or at least there could be, if Obsidian decides to go with this idea.... (no joke, i literally just thought of this while typing my argument)
Insect mind control technology. This is a sci-fi game after all. If there are several miniaturized labs all around the yard, maybe one of them could be hiding technology to control insects. It could be control chips, brainwashing chemicals, or who knows what else. We don't yet know what the other labs are be hiding. Hopefully, this could be one of them.