Not to mention smart-watches too, which also do calling and texting.

I feel like at least some of these can be consolidated and the only reason they're not is because of arbitrary limits. I don't see any reason the ipad can't be more open like a laptop as well as operate as a phone (some android tablets can). You could use the watch as your "notifications and reach me asap" device.

But overall I always end up overpacking just because of being afraid of needing something I don't have.