Are there advantages when my website is made completely from Flash?
There are advantages to implement Flash in some components from your website, but we do not advise to use Flash for the entire structure since it is difficult to adapt the functionality or improve it. Additionally, there are limits in search engine visibility when a website consists entirely of Flash.
Since 2014 though we recommend no longer to use Flash! Everything that you want to do with Flash can now be achieved with HTML 5 and custom coding.
KB Article: https://loginsecure.eu/helpdesk/knowledgebase/view-article/5-are-there-advantages-when-my-website-is-made-completely-from-flash