I can ;-) (having enough reputation helps) But agreed, some limitations are a bit stupid and annoying at times. E.g. you downvote an answer based on the belief

I can ;-) (having enough reputation helps) But agreed, some limitations are a bit stupid and annoying at times. E.g. you downvote an answer based on the belief that it is wrong, further discussion reveals that it is in fact correct, but since more than five minutes have passed you cannot remove the downvote or turn it into an upvote unless the question is edited again. Which leaves to bogus edits just for being able to change a vote again.