As someone else pointed out, the premise of this question is extremely faulty. Being user-friendly is one of the main advantages of proprietary software because they have teams of researchers and designers making sure that things are as frictionless as possible for the user. This isn’t to say they don’t use dark-patterns or engage in anti-consumer practices, but I’m certain that if you did a random sampling of F-Droid and the Play Store, you would find a lot more polished and user-friendly software on the Play Store than the FOSS apps on F-Droid