Earlier quoted context omitted.
There is a small but major difference with Flash vs Minecraft and Roblox. Flash let you create something from scratch (or close to it). You aren't just modding a game, you are making a game or a cartoon. It was fantastic. Minecraft you are limited to the world of minecraft.
The amount of commercial games that used (and still does actually) Flash is much higher than many could believe. Jackbox is probably one that many here have played in the past few years. Some games used it only for UI, like Borderlands.
A lot of games today use an HTML-powered UI library from Coherent Labs which can still be authored using Adobe Animate (i.e. what the Flash editor turned into): https://coherent-labs.com/