Ya, my confusion come from the documentation saying they can be a "physical stack", it always says "physical", which makes me think it's not a real logical stack (logical single switch). It also emphasizes single IP management, which, again, is not the same as a single switch.
I just need to be 100% sure because it's being suggested as a less expensive alternative, which I'm all in favor of if it can do what's needed, but the HA/FT of the system is reliant on being able to aggregate across stack members.