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The point of using English is that you’re less likely to make a mistake when writing them down. If it were words in a language you don’t speak, many people would mess up when writing it down and cry when trying to restore.
If there were **random letters** o_O in every word, literally **everyone** would mess up.
The odds of anyone guessing your seed phrase are so close to zero that there is no point in optimizing it further. Diminishing returns: you would be making it more difficult for yourself, without any appreciable effect on the attackers. It’s like, you know, you just bought a top-of-the-line personal safebox, put it in your basement, behind that heavy-duty safety door with a code lock and fingerprint scanner, and are now considering: would it be a little bit safer if you put a padlock over the fingerprint scanner? Or maybe if you boarded up the door to the basement? I mean, it _would_ technically be that much safer but is there actually any point in doing that?