> In general, streaming services have to ensure maximum compatibility when playing their contents on all kinds of devices - high end and low end. For which on low end device it could be very resource constraining to render typesetted subtitles. There are other platforms where all video playback have to be managed by the platform system frameworks with limited format support, and streaming services can't do much about it.
Surely if my mid-end phone from 2015 supported everything .ASS has to offer, they could do it either?
In any case... I don’t believe the problem is that Netflix and Crunchyroll have to support low-end devices, it’s that they don’t want to pay $$$ for typesetting. They are big enough now that they don’t have to care, so they don’t – just another example of enshittification.
I wouldn't bet that every smart TV Crunchyroll wants to be available on has more processing power than your phone from 2015 (some of those TVs might be older than that), but yes, it's probably less about hardware capabilities than about platform limitations that make the usual solution of compiling libass into a blob and integrating it into the player not so easy to implement.