Will Grand Companies ever get an update?

[Iscah]

But the squadron completely ignores every mechanic, so how do they have to be programmed to handle them? They never handle them to begin with.

I think that's part of the problem. I haven't gone through the list, but for example they can't do Qarn - that might be because they would mindlessly attack the stone heads that need to be manoeuvred into position on the switches.

Since GC ranks forced you to use Squadrons, I haven't ranked up at all. So unless they remove that requirement, no.

Only the last two ranks require you to level squadrons. There's no need to avoid the system entirely.