I heard many times i should avoid flash for my website. Yet no one has told me a good reason. I searched for reasons and i see many that are not true (such as text in flash are not indexable by search engines) or may not necessarily be true or significant enough (eating more bandwidth. Would a JS equivalent be bigger or smaller?).

My site uses flash to playback sound (m4a). I dont have to worry about indexing, the back button not working, etc.

But i have feeling there may be other reasons. What are reasons i shouldnt use flash on my website.

I'll note one, the fact iphone/itouch and mobile devices does not support it. Not a big deal for most sites and is obvious. What are reason to avoid flash on my site?