Likely this is to prevent malicious attempts to block access to an account- I can definitely imagine someone trying to block a popular account by abusing the pa

Likely this is to prevent malicious attempts to block access to an account- I can definitely imagine someone trying to block a popular account by abusing the password reset mechanism. Imagine attempting to reset a password of a popular account by spamming the p/W reset mechanism, if the limit is per-account instead of per-IP then you could fairly easily deny access to any account.