AutoScroll (timed) lyrics are still relatively rare and not many users have that metadata in their files already.
I agree it *should* be in there but I really don't know what % of JRiver's considerable user base would actually take advantage of it.
What's the best database for timed lyrics btw? Any consensus / clear winners?
I live in China. There is no music app in China that doesn't support syncronized lyrics today. Netease Cloud Music and QQMusic have full timed lyrics support for each song, whatever language it is. QQMusic supported Real-time desktop lyrics almost 10 years ago. A music player should have scrolling lyrics has been a common cognition for every Chinese people.
There are multiple tools to download lyric files (.lrc) from these online music platforms. It is the same as writting lyrics into tags.
I doesn't know much about Amazon or Sony, but Potplayer, Apple Music, foobar2000 with plugin (eg. OpenLyrics, Lyric Show Panel 3 which has youtube tutorial 9 years ago) all support syncronized lyrics. I believe it's not only just that features need to be developed, but also that they need to be developed before anyone will use them.