I was around when Flash had its heyday (~2005-2010 or so) and in those times it was the other way around: Screw anyone who doesn’t want to use Flash/who wants to use only FOSS software/who is using another CPU architecture than x86.
Keep in mind that Flash was not an open platform. Far from it. Adobe held it in an iron grip and it was their way or the highway. So no, I don’t feel sorry about the demise of Flash.
Edited to add: Also, on macOS you are free to run any browser you like. As long as the browser supports Flash you’re set. When it comes to iOS then Apple had good reasons to not support it. If you want to develop for iOS you can use HTML5 instead or build a native app.
Keep in mind that Flash was not an open platform. Far from it. Adobe held it in an iron grip and it was their way or the highway. So no, I don’t feel sorry about the demise of Flash.
Edited to add: Also, on macOS you are free to run any browser you like. As long as the browser supports Flash you’re set. When it comes to iOS then Apple had good reasons to not support it. If you want to develop for iOS you can use HTML5 instead or build a native app.