I was an "ActionScript 3" developer around 2010s targeting browser, but also offline "Rich Internet Applications". Together with our designers, whom worked in Adobe Flash, we had a tremendous throughput of production ready applications. Today I program React.js/TypeScript applications. What a slow turtled pace of getting things done. :( And of course very very expensive to develop. And a lot of things aren't even possible anymore. Of course, the Flash platform had it's downsides too, but in terms of throughput and productivity, this was very very great.