Most of the crimps in a computer or electronic device are to hold heavy components on to the device where solder might not have enough mechanical holding power. Things like plugs that come out through the case that the user interacts with directly are often crimped on to the board so that they won't break free when the user does what users do. Electrical connections are still solder, they are just crimped too to help hold them to the boards.
What are you pretending not to know ?
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