I recently uninstalled the Facebook app from my Android phone, and all is well. In fact, things are better than ever. The Facebook app is a serious strain on the battery, even when you're not using it.
It turns out the mobile version of the Facebook website is just as good as the app. So I created a shortcut on my phone to the page for my custom Facebook list, which also allows me to conveniently bypass the Facebook algorithm. I highly recommend this, you can see more here.
So with a shortcut to the custom list page on facebook.com instead of the app, it's not only easier on my battery, it elimnates the need to install a second Facebook app for the Messenger. Easy peasy.