You're trying to make a binary argument and apply it to something that's not binary. I use a 2nd generation iPad 12.9 as my main device and I have yet to have difficulty completing a task I needed it to do. While I'm not a "power user" and don't use my iPad for work-related tasks, I do quite a bit with my iPad and to me it's superior to a laptop.
I love how the screen "loads" on my iPad pretty much instantly. I even love I can focus on one task, but also do some pretty good multitasking. I love the picture in picture feature of apps like Netflix. These are just examples of advantages the iPad has for my use case, over a regular laptop. Your mileage may vary.
I don't have to prove this scientifically. I just need to enjoy my iPad.
That's good.. but you still haven't show that iPad CAN replacement laptop. It is either can or cannot. iPad cannot replace laptop, it is two separate devices functuons different for different purpose. Laptop and iPad maybe can do something, but two are completely different kind of product.
I like how people go say, it worked for me, so it must be true.
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It depends on the user/task, end of story.
No. I am still not convinced. Yes, different people using iPad different way, but iPad and laptop are still fundamentally different for different purpose.
I am still not convinced the notion that iPad is so powerful and it will replace your laptop. It will not.