My web app has zoomable interface with a minimalist slider to indicate the zoom level.
I was told recently that not having the buttons as part of my slider is an UX problem (without a UX study, purely as personal opinion). I tend to disagree because I believe it is pretty obvious and it is more important to keep the interface as clean as possible, but obviously I am not objective.
I know Google Maps even hid the slider by default as an indicator in their latest redesign and kept only the plus-minus buttons.
Is it even obvious that my app has zoomable interface? And if not, would the plus-minus button on the slider make any difference?
What do you think?