I noticed this as I started getting in-game notifications that my Deadly Boss Mods addon was out of date, despite the fact that I had been getting it automatically updated from the Twitch app since forever ago. Sadly, the Twitch manager has already stopped automatically updating several addons for a few weeks now. Especially as the launch of Shadowlands nears, this becomes crucial.
That means if you’ve been using that popular addon manager, you might already be aware that you need to find an alternative. In June 2020, Twitch sold CurseForge - which was responsible for its popular World of Warcraft Addon manager - to another company, Overwolf.