It's impossible to tell which games were made by kids, but take a look at this:
On top of that, for kids learning to make games, the idea of getting a $20/month Adobe CC subscription is a massive stretch. For it to catch on these days there would really need to be some free tier.
I did a few Flash games myself when I was young, it was amazing, so quick to achieve a result. A decade later I tried doing the same over Unity, and I couldn't do much...
Vector graphic allow you to easily draw something quick and animate it easily with interpolation. It also has the advantage of looking great whatever resolution you got. 2D graphic allow you to not be concerned about performance that much, nor does it require complex manipulation to be used quickly.
Which with the addition of timelines editor and ability to add Javascript code we think is pretty much on feature parity with Flash.
Be interested to hear if we're lacking in any way compared to Flash as we'd like to close any of those gaps!