For Oculus Go and Google Daydream, you have a tiny controller with a couple of buttons like the one at the bottom of this page: https://www.oculus.com/go/accessories/ Instead of moving it physically "onto" a button in 3D space, you just "point" at the button using the controller, and then click.
"Easy" to aim and click may be a stretch... I have only ever tried the Vive's implementation before but it felt a lot like holding a laser pointer - basically impossible to get any precision because your hand vibrates so much in ways you don't realize.
> Doing it with your eyes may be preferable long-term
On the contrary, gaze control was forced upon us when phone-based VR had no access to a controller. It's actually rather unnatural. We look at many things without wanting to activate them so you have to have a secondary cue for "clicking". Usually a timer: "stare at this for x seconds" which means every interaction is an exercise in patience.
Gesture control is probably the most natural if done well but when done badly it's fairly awful. I still can't master clicking on a v1 Hololens and I avoid using the thing without a clicker.
Simple unobtrusive controllers are going to be the best bet for a fair while I suspect.
