Flash is one of those necessary evils. It was like Java, reflexively installed onto computers that weren't really quite up to the task of running it. Just checked, nope, I don't have Java - and you should not either.
The computer would bog down, act cranky, and even crash when Flash was running. Flash also has persistent cookies that you had to remember to delete. Some people would have those cookies for years. Security is a bear.
But there is one more nail is in Flash Player's coffin. Youtube is now preferring HTML5 over Flash when you watch videos there.
Why is that important?
More and more Flash had been the target of people wanting to hijack passwords, insert viruses, and track your movements with those persistent cookies. Adobe had put more and more patches into it and it became a joke. Start the computer, patch Flash, restart the computer and do your work - every single day.
Worse, some people that I supported would simply tell the update check to go away and never come back.
You are getting closer to the day you can do that for good. Many of us already have.
My Linux computer, currently Xubuntu, is not even supported on current Flash Player, and I did an uninstall of it a couple weeks back. I didn't see the value of keeping an old piece of software on something that was running well without it and I almost never used.
My windows computer will get the same treatment.
About the only thing I ever do with Flash is to watch videos on Youtube. The few games that I have kept over the years will get deleted.
That's about the only problem that I see with this. Videos can be streamed using "native tools" but the content that was created in Flash will simply go away. Quite a lot has been created in Flash over the years, even a few Broadcast TV Programs, and many commercials as well.
After all, when was the last time you played a video tape? Beta? VHS? Vinyl Records?
That is the kind of problem that Librarians have. Content on a platform that is unsupported. Music on Cylinder Beeswax Records from the Edison era. 78 RPM records. Heck, I even have a few 45s floating around here. Silly looking 7 inch donuts.
For most of us, it's simply easier to find the track elsewhere and save it on something new. But for librarians, especially archival libraries, they have to worry about that sort of thing every day.
Anyone still have and use a zip disc? Nope? Didn't think so!
So the net result to you is that if you are running one of the four major browsers in one of the top four major operating systems on the desktop/laptop you're fine. Just make sure your browser is up to date. Firefox, Internet Explorer, Chrome, and Opera all work with HTML5.
See, that's easy!
The iPhone and Android based phones will typically use the Youtube client or the browser will take care of it.
One aside though, with Android, it's usually recommended that you do not use the base browser and go out and grab either Firefox or Chrome. The reason is that if you are on an older version of Android, Google is not going to support the old "Browser" browser.
So it's just safer that way. Listen to big brother even if it is a bother.