How to use pointers internally?

Starting on Internals, after only making externals for the past few years.

I know I can do something like

but then what's the point in even being internal, since I'd have to signature scan for offsets anyway. And knife/skin changer would still be a bitch with the ForceUpdating and whatnot, right?

So my question is, how can I use pointers internally without needing to signature scan every offset like I would externally? I don't want to use someone else's SDK, I'm trying to learn, not paste. I've looked through sources, but I still don't quite get it. I have no experience with internals. I've gotten a bhop to work, but that's only using reinterpret_cast with offsets.

edit: so I've checked out Zat's internal base again, and he also scans for the offsets, even though it's internal. Is this actually how it's done? Though, he doesn't use reinterpret_cast at all, why is that? Wouldn't getting the offset return a non-pointer type?