That "libappindicator" library being dropped isn't the first time there were problems. The article in yesterday's Steam/Proton post also mentioned it (https://news.ycombinator.com/item?id=30490570). And in any case it seems like it's either considered feature-complete or abandoned, there have been no code-related commits for 12 years now (per https://bazaar.launchpad.net/~indicator-applet-developers/li...).
That "libappindicator" library being dropped isn't the first time there were problems. The article in yesterday's Steam/Proton post also mentioned it (https://news.ycombinator.com/item?id=30490570). And in any case it seems like it's either considered feature-complete or abandoned, there have been no code-related commits for 12 years now (per https://bazaar.launchpad.net/~indicator-applet-developers/li...).