Why?

TL;DR: Twitch had a partnership with FTB, and last year that wasn't renewed, so we are moving away to our own app.

Read more about it here:

 

FTB App Launch post on FTB Forum:

https://forum.feed-the-beast.com/threads/ftb-update-new-launcher-ftb-omnia-released.302085/

 

Original partnership end announcement post on FTB Forum:

https://forum.feed-the-beast.com/threads/on-the-31st-october-2019-the-partnership-between-ftb-and-twitch-will-be-ending.300783/