After a discussion with a friend, I realised that android is much different to sighted people than what talkback is reading to us.
For example, if I remember right, the home button is a circle on the screen and the overview button is a square.
Also the more options button, which usually brings up additional options to an application is 3 dots.
So if we tell a sighted person to click on more options, probably they would tell us that it doesn't say anywhere on the screen more options and they wouldn't know what to do.
So we need to know how things look on the screen so we can help people either with their phones, or if talkback stops working and we need to tell them where to go and fix it for example.
We need to know some important aspects of an android phone such as the launcher, the phone app, the messaging app and the clock app which includes the alarms etc.