I wasn’t previously aware of this design principle: https://en.wikipedia.org/wiki/Principle_of_least_astonishment
Thanks a lot for the info. It was an interesting read.
Regarding the above statement, I would say that same applies to the Plus button in its current state (despite lacking the opposition of a Minus button). There is no reason to believe that pressing it won’t increase your balance (without the need for a bank transfer). In that sense I would say that it also breaks the Principle of least astonishment.
- Pressing the Plus button leads to an area (Add Money) which gives you the ability to increase your balance (via bank transfer).
- Pressing the Minus button leads you to an area (Pay) which gives you the ability to decrease your balance (via bank transfer to another).
I would say that this classifies as a form of stepper, unconventional as it may be.
However, I agree that despite this logic, better alternatives exist.