I only do it whenever I make mistake with hashtag or beneficiary.

You should have to be careful about this... The wrong hashtag is not a problem or forgetting to set beneficiary is not a big deal, people do mistakes and curators understand that. The problem is, there is a chance that a user might repost those content thinking this time I will do right...TFC doesn't support those users who try to remove their posts from the steemit interface and post the same content again to make it right...

It's better to edit those posts or post fresh posts always... You can edit those posts but when you try to remove the whole content, it will affect your reputation soon... Curators don't take it positively...