They help prevent infection of the upper respiratory tract, think of them like the hairs and mucus in your nostrils, for trapping germs in a sense.
Infact, having your tonsils or adenoids removed increases your risk of upper respiratory tract infection by 2 or 3 times. Having only your adenoids removed doubles your risk of copd and conjuctivitis. There are other effects but you can see that they do serve a very useful purpose, modern medicine has just made the long term side effects much easier to deal so we don’t considered them so serious.
They are a first-line immune system organ. Things come in the mouth and the immune system gets a look at them in the tonsils. It helps with being ready for infection and disease, but is not essential. It’s a nice thing to have, but not essential. Sort of like a sense of smell or taste are nice to have but not essential.
Meanwhile, if you lose both kidneys, you have no way to process waste in the blood, and die.
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