The problem is mostly that there doesn't exist some kind of standard for animators where they can make their animations in their editor and then export it for web.
Lottie started out as a plugin for Adobe After Effects to try and let them export animations for use on Web. As far as I know this is the only "half-standardised" way of exporting animations between tools.
If you don't need animations from a dedicated animator then the better solution is using "a pile of JS + CSS transitions", and hopefully this is what Lottie for the web eventually "compiles" into.
Lottie started out as a plugin for Adobe After Effects to try and let them export animations for use on Web. As far as I know this is the only "half-standardised" way of exporting animations between tools.
If you don't need animations from a dedicated animator then the better solution is using "a pile of JS + CSS transitions", and hopefully this is what Lottie for the web eventually "compiles" into.