Portal for ArcGIS has a home page that looks like it was designed in 2001 using Adobe Dreamweaver. It's absolute garbage. That would be fine except the Portal Home HTML Configuration strips out Javascript, lots of HTML tags and requires inline styling.
I understand not wanting to allow Javascript and such. However, Portal already ships with Calcite-Web. If this framework were made available in the Homepage configuration, that would allow organizations to build some really great landing pages.