But they are still readily available, despite the extra step. All it takes is one bored day to hit download in the app store and be doom scrolling again. It would be like if you didn’t have the supplies on you, but you drove by your dealer’s house every day on your commute (or had his number in your contacts). Every time you look at your phone, you know the option is right there and have to fight that temptation.
Another example would be having alcohol in a locked cabinet. Sure, it’s locked up, but if you have the key in your pocket, the people that it’s going to stop are the people with a strong will anyways.
The people who really need the help are just going to end up in a cycle of uninstalling and reinstalling Facebook over and over again because that option is right there in your hand every single day.