It can slow down your site, or some visitors can have trouble viewing it based on the device they are using or the internet connection they have. You want to make the visitor experience the best you can and if flash is messing with that, you don't want to use it.
Natural Health advocate for 34+ years because it's keeping me young and energized!
Loving the world of entrepreneurship to help people and to be flexible for family http://AntiAgingByDesign.com
Central PA USA