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Not exactly. There are some species which haven’t changed all that much for millions of years, and those have certainly managed excellent adaptability.
Others, though, might find themselves evolving to cope with the climate right now at the expense of being vulnerable to some future problem. Say the climate is very hot, but in a few tens of thousands of years there’ll be an ice age. An animal which is well adapted to the ice age will probably go extinct before it arrives, having all been eaten by an animal well adjusted to the heat which is here right now.
“In the end” isn’t useful if you get outcompeted in the meantime
Because you might accidentally do something which breaks the system, or you might run a program which does something malicious without your knowledge.
By gating dangerous (or protected for any other reason) commands behind sudo, you create a barrier which is difficult to accidentally cross