"Flash" didn't drop anything. Adobe is the company you're looking for. And what you said is the same thing I said. Adobe is the reason for lack of Flash on Jellybean not Google. Adobe dropping support for Linux is dropping support for mobile.
Well, couldn't Google make JB compatible with the same Flash that works on GB and ICS if they wanted to? Just because Adobe isn't going to improve it or support it anymore doesn't mean it suddenly stops working. So it is Google's decision not to make it work in JB.
xtn