https://x265.readthedocs.io/en/default/presets.html
It looks like there's an official Animation tune now. Will this be added to Handbrake? Alternatively, is adding the parameters in extra options basically the same as choosing the tune?
x265 Animation Tune
Re: x265 Animation Tune
Yes, applying the extra options to your choice of preset gives the same result.
Re: x265 Animation Tune
In addition, tunes are obtained automatically from libx265, HandBrake will get the new tune next time we update x265.