> It occupied the same space that Electron does today

This. Except Electron crap at least runs on top of a well-designed and relatively reliable platform (HTML/Chromium) - and sometimes the crap even offer an actual PWA version with all the sandbox benefits a real browser has to offer. Flash didn't even had that.

And let's be realistic, there will always be demand for a crap-running platform for vendors that don't care (or just have their core values elsewhere).