If you are going to do it, then do it; and Apple does.

I have created web sites by hand. I have also used various WYSIWYG web editors — most notably Adobe's GoLive. This is going to be simply great for the people who want to creating a web site at a level they have come to expect from visiting professional web sites.

Apple does not try and prevent you from saving the site to a folder. Which, frankly, if they had blocked posting a site to anything but dot_Mac would have created a non-starter no matter how good the application. For this reason: no one should spend their time making a web site, or blog site, that is locked into any one, proprietary, host service.

There are two negative points:
(1) the size of a site due to image redundancy.
(2) a glitch with iWeb's UTF-8 character set posted to the Linux server available to me, resulting in curly-quotes showing as odd characters (glyphs).