Apple mobile devices doesn't need flash... Google supports flash. Google has Chrome and will release their own OS soon to compete with macOS. What's next?
As an avid user of all these products, I know each one has flaws and most of the time they compliment each other. In my own experience, Gmail now can support drag-drap email attachment in Chrome and Firefox but not in Safari. but I hate Chrome when browsing though they are fast.. the auto download of images slows down my work and eats up my download folder.. In safari, I can view images and drag it straight and all the way to Adobe Illustrator of Photoshop without downloading them. I don't know what will happen to this war, but I believe it's a healthy competition and most users will benefit.