No way am I upgrading. I *just* pulled the trigger to 4.3 and my phone battery has gotten much worse (phone radio stats are RIDICULOUS) and I have no idea why. Breaking flash would be a horror story.
Not a huge Tech guy myself. but I can tell you my internet browsing has been better since the update. More "things" are working on wesites. For example. I subscribe to hockeyfights.com. I couldn't watch the videos prior, but can now. Probably has nothing to do flash, just saying my experience since Kit Kat has been better. Flash or not