[xdude]

And that requires a really great knowledge and also to understand how Wordpress works.

If you want to run a WordPress site then you need to have a good knowledge WordPress. Once you start using it you get that sooner or later depending on how hard you work on your site. But the benefits you get from that is 10 fold of a HTML site. IT saves years of coding time as well as time you have to spend learning high level of PHP. Then come those plugins which give you functionality which would take light years for you to master.