Since the early introduction by GMail, i have already liked the conversation view of GMail. It simplifies on how we manage our emails just like a conversations. But it seems that not everyone like the idea of that and today, GMail has introduced an option to remove this feature from GMail.
By disabling the conversations, you will get a normal threaded email based on the arrival date. IMHO, this will make email management becomes more complicated as you have to find the related email replies in your inbox. But hey... it's your inbox right?