I had a formative experience with Flash as a middle schooler. I loved Albino Blacksheep, Newgrounds, etc. I thought the videos were hilarious and the stick-figure-style animation was approachable. So I acquired Flash, and I was blown away by how easy it was to create these silly animations. Automatic tweening was a miracle to me. Since then I've done a lot of video editing with different tools, but I still think back…
https://www.anim8.io might spark your imagination again. Lots of animators are still making indy animation, it's just been drowned out on the major platforms due to how time consuming it is to create and it's basically not possible to monetize well outside of Anim8 now (YouTube algorithm favors frequent uploads and high video duration - not compatible with animation).
However, I'm a little disappointed that it seems to output in MP4. Is there really no modern format for vector video?