Where do you get this BS? Only the lowest model iMac is made with what could be termed laptop components. iMacs can have Intel i5 to i7 processors and full power supplies in them as well as fans and stereo speakers designed by Bose. SHEESH!
I agree with the overaggressive spell check, but you just have to be paying some attention. You don't have to accept Apple's spelling, even in an iPhone if you know what you are doing. It takes no time at all to accept YOUR preferred spelling of a word. Just tap the version you spelled on the option at the top of the virtual keyboard rejecting the corrected spelling. Done. I just tried it and it worked perfectly.
http://www.everymac.com/systems/apple/imac/specs/imac-core-2-duo-2.0-20-inch-aluminum-specs.html
This is the model I owned. On the inside its all laptop parts except the hard drive which eventually died from the heat.