Why must upgrade website (remade website)?

According to the survey results to clients and receive our job to most web because of the following reasons:

     Need more appealing web interface: nice and clear, presenting more scientific
     Need to sync with the brand identity of the company
     Adjusting the content to fit the actual operation situation of the company
     Optimize your website programmers to easily update content, artistic, friendly to search engines (increased ranking on the search results page)
     Web faster, more stable
     The life cycle of the site is 03 years.