Fixing mistakes in a needle felted piece

I read a lot of posts and most of them said do not cut your felted sculptures that you should always pull it apart so that isn't always  possible and you know what I don't think its even necessary I've cut my things apart many times and I've been able to cover it up and make it look just fine so I don't know what they are saying when they say don't cut it I've been just fine by cutting my things especially when I make something too skinny I cut it up the middle shove a ball inside and then seal it back-up seems to work just fine for me.