Apple enthusiasts buy Macbook Pros or iMacs. There’s nothing wrong with integrated displays. In fact, it saves on a ton of cable mess, and they are usually worlds better than what you would plug a computer into anyway.
There's everything wrong with integrated displays. You can't use it for dual displays. You can't upgrade the display withhout upgrading the computer. And if you get a bad case of stuck pixels, you need to carry the thing to a mall and pay out the behind for a replacement panel which requires complex surgery on the device.
What? There is a lot wrong with AIOs.
1) Cooling is atrocious
2) Dust problems
3) Very difficult repairs and almost impossible upgrades (with some exceptions such as RAM)
4) No internal expansion. You save a cable with the monitor but you add cables for everything you want to add.
5) Once some component dies you have a very expensive monitor that can't be used for anything.
6) Much like laptops, tablets, and smartphones it's an environmental disaster.