Why different laptops need such different adapter with different tips?

I found a very powerful laptop charger on amazon, :bounce: :bounce: link here , as its review shows, it can power lots of laptops and can also be used as a car charger, besides it can power smartphone at the same time. I am just curious why different laptops requires different type of DC tips, if they all designed the same, I can only use one adapter to resolve all different adapter need. :pt1cable: :pt1cable:
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  1. Best answer
    Because they want you to spend money on their specific charger, it's another way to keep making money every time a charger dies.
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