Flash had its problems but as a user, it looked sharper and smoother than even current websites. And its editor gave non-tech users ability to create amazing animations, interfaces, and even games.
I didn't get into flash games at all, but I used to watch Flash animations.
Like, for instance, Salad Fingers: https://archive.org/details/flash_salad-fingers
This was intended for a slow 2004-era computer with a 4x3 (probably 1024x768) display, where it worked very well.
But it's not 2004 anymore; things are much faster and screens have gotten a lot bigger. Here in 2026, Salad Fingers renders out fine at higher resolutions, and at different aspect ratios. It works great on my desktop at 1080p, without stretching [and with some probably-unintentional extra content on the sides]. It even works on my pocket supercomputer's 3200x1440 20:9 display.
Vectors are fun, and they scale as technology improves. The lines remain smooth and defined. And with Flash, that's a built-in: An unaltered 22-year-old digital animation still looks crisp.
For contrast, if Salad Fingers had been published on YouTube way back around that time, it would have been in chonky fixed-pixel 320x240. Maybe that would be as good as it would ever get unless it were rendered and uploaded at higher resolutions later.
This isn't my baliwick, so I've absolutely nothing to say about the ease with which these options can be created.
Today with the current focus on mobile+low latency+e-commerce optimizations flash would probably have shown a lot of limitations, yet JavaScript, SVG, canvas, http webgl etc still fail to provide a "competitor" to what flash used to be.
The web simply went in a different direction, one that left many unsatisfied
SVGA graphics, being vector-based (as the name suggests), are indeed sharp, most notably when scaling up or down, and I've encountered SVGA-based interactive graphics which are reminiscent of Flash-based animations in that specific regard.
Again, I'm not addressing other aspects of these options, and I do very little direct development of this type.
I'm quite familiar with the claims that Flash was attractive to publishers and creators. On the receiving end, I was less impressed. Odd Todd excepted. The proprietary nature (I generally run Linux) and constant security concerns, as well as hiding web content within an inaccessible format (e.g., text couldn't be readily extracted) were all frustrations. I'm also generally not a fan of any animation.