Looking at that link, the Mark VI/VII has more stops of OIS, which is more important for point and clicks, especially when zoomed/shaky/low-light. The f-number isn't the aperture size, though it is affected by changing aperture. The values you quoted are related to the f-number at both the lowest and highest focal length.

Whether you value OIS is more a matter of personal opinion. I don’t need to shoot at lower shutter speeds generally, especially with these Sony sensors which are pretty great at higher ISO.

Point taken on f-number and aperture not being equivalent, but that’s getting pretty picky ... f-numbers are ratios of focal length to aperture diameter and so effectively do represent aperture size. The point is the smaller f-numbers will give a more shallow depth of field, and at this point, that property is one of the few advantages that a high-end p&s camera has over a nice phone camera (yes, I know some phones are faking shallow DoP in software).