Why we don’t have 128 bit OS or CPUs?
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5 year old answer: Imagine you are in math class and your teacher gives you math problems of certain complexity which yield answers of certain length. Now, you have to work on and turn in your homework in a piece of paper that can fit the math problems of the right complexity. Now, the issue is that your paper store only sells pages that are exponentially larger than the last size and twice or more the price of the last size.
In first grade you used 8 bit paper, in second grade you used 16 bit paper and you were upgrading your paper sizes with time until now that you’re in 6th grade and you have the choice between 64-bit paper and 128-bit paper. The math homework your teacher gives you is of a complexity that is too large to fit in 32 bit paper, doesn’t completely fill the 64-bit paper and your 128-bit page, being larger than the 64-bit page, can fit the problem with no issues but also with tons of wasted space. So the sensible decision would be to buy 64-bit paper until your math homework becomes too complex to fit in it. Also, since everyone else in your classroom is taking the same decision to turn in their homework in the same sized paper, the paper maker says “business is boomin’!!!” and makes more paper, which makes it more affordable, meanwhile 128-bit paper stays a lot more expensive in comparison, to the point you might wanna try out quantum paper.
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