Because doing so binds every character within that character group to
self-insert-command without having to bind several thousand characters
individually.
So what? Binding thousands of characters is something computers are good at.
Or are you saying that that would affect performance in an unacceptable way?
It would require allocation of an array that could be pretty big and
all its elements would be the same. We have set up this mechanism as
a convenient way of saying "Use the same binding for all these
characters" without allocating space for individual bindings for them.
It is a good thing, I am not going to change it, so please don't argue
about it. We have other work to do.
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