Everything old is new again, and the more things change, the more they stay the same. That said, the Flash client was closed-source, buggy, security-challenged

Everything old is new again, and the more things change, the more they stay the same. That said, the Flash client was closed-source, buggy, security-challenged, intrusive, and a memory/battery hog. All that contributed to its demise. It also helped that it was denied access to what would become the world's largest consumer compute marketplace: the Apple App Store.