There are several drawbacks to all in one computers. They are pricier than desk top computers due to the convenience of less parts. Also, repairs on the all in one computers can be more difficult and more costly.
More then one or two computers
It's highly competative since almost everybody now (mainly teenagers) are adept at the operation and fault removal of computers. To gain a safe career one must be proficient at programming or system diagnostics.
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Change to a more proficient transmission.
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More powerful computers can analyze global weather patterns in more detail
The one you're proficient with.
Yes. Even on more computers at once, in the same time.
The question is better phrased as: can one practice engineering without studying computers? The answer is sure, but very rarely can an engineer work without a computer these days. So, at least one needs to be a proficient user of computers; he/she does not have to understand how a computer is built or how keystrokes become characters on the monitor screen (sort of like a driver does not need to know car engines, but better knows the function of all the knobs and levers, and how to avoid accidents).
connects two or more computers or laptops to one device
She was one of the first programmers of one of the first computers. See the related link for more information.