There's appeal for keeping it simple. I agree, for a short range gun like a plinking 22lr or a fighting AR or a brush gun for example. There's nothing to adjust, no moving parts, etc. The magnification and holdover is always the same.
For 100-200 yard shots (or further) in more open country I'd prefer the option to zoom in a little even if I don't use it much. 3x-9x is popular for just that reason.