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Why are the recovery keys so simple? Is it safe that they are so simple?

The 24 words are picked randomly from a list of 2048 possible words.  So the 24 words are digits of a base 2048 number.  That means there are 2.9642775e+79 possible combinations (in math it would be written as 2048^24), which is a 256bit key.

This is the encryption key to unlock the secret material that is your identity for your accounts.  So while it is simple, it provides a large number of random bits and provides the highest level of encryption in use today.