My issue with Flash was always that it was a performance hog and buggy. I have it on my main rig but there was no way in hell I was installing that on a mobile platform where battery life is at a premium.
I also feel Flash has been overdone and some sites use Flash just to use it. It's not used for any real purpose except that they can. I prefer Firefox and always install Flashblock as a result.
I also feel that mobile phones (not necessarily tablets) was the wrong market for Flash. For such a small device with screens that usually runs in the 3.5 to 4.5 inch range, a dedicated app was probably the better approach. And from a safety standpoint, it is more secure to use a dedicated app to access stuff like your bank account. More secure does not mean it's entirely secure but it's a hell of a lot safer than going on the web. Yes, this is the Apple walled garden approach. There are times for full control and power but the phone is not it.