Indeed.
You talk about "expectation is only mediocre" and "squeeze a bit more out of the phone" as if these are universal constants. My demands are in performance (think reliability, not tech specs), but less in versatility (I don't have the time or inclination to customize things beyond the background images). I'm not going to say that Android can't meet my needs, because I've never used it. Based on this review it seems that Android would require too much tweaking and upkeep.
The reason why you don't see iPhone users talk about tweaking and upkeep is because they can't do any. They just learn to live with the shortcomings. Of course if someone has only use an iphone then they are less likely to realize what those shortcomings of iPhone are.
Btw I don't know what you really mean by reliability but the s3 I have is very reliable. It never crashes. In fact my ip4 requires more reboot.