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Modularity though.
If you want something lightweight to watch movies on then an iPad is great. Watching it on a laptop is ok but the keyboard is superfluous.
If you want something to do typing style work on then you need a keyboard attached. Laptop is better for this obviously.
An iPad with a keyboard offers the option for both but with a compromise that is less (for some people) than the compromise of having a non-detachable keyboard on a laptop.
An iPad is generally just less fuss for doing things like watching movies or live streaming TV as a second screen (which is mostly what my iPad does). Playing games on it (mostly what my daughter does with ours) is also a better experience than on a phone screen.
But, generally, they're just extra toys for people who have enough disposable income to be able to buy one. I speak as someone who wouldn't be anywhere near as a productive on an iPad/keyboard as a "proper" setup with separate screen. I'm kind of envious of people who have the type of jobs they could just use an iPad for the vast majority of it, or even just a single laptop.
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Weights for the new keyboards are currently suspiciously un-unpublished. IMO they need to get under 1kg for the pair (so ~550g margin on the 11" keyboard, ~420g for the 13" keyboard) to rival the portability of the old 12" MacBooks; due to the absence of figures I expect this is not the case.
My current 10"-whatever iPad pro with keyboard is heavier than my 13" air and it annoys me immensely.
I think the maddest thing is that, once you add the keyboard, because the base has to be artificially heavy in order to balance the weight of the battery in the iPad itself (i.e the screen) it is actually heavier than a MacBook, at the same size...
So...