Flash was a big part of my development life 15 years ago
I used to use Dreamweaver and Fireworks from Macromedia, and Flash sites were very cool, even with my limited graphics skill. The problems with flash for a web site are
1. A flash image has no useful text for the search-engine crawlers to read, so your site is ranked lower than an html site created in notepad.
2. Flash sites are harder to update than regular sites, and much harder than WordPress sites.
3. Flash is large and takes a lot of time to load.