> OK, but... like what?

Well nowadays you can implement pretty much anything as a web page, so 
you could argue that any phone app could instead be implemented as a web 
page. The point of an app is that it can take on the same UI as the rest 
of your device (menu options, saved data, sync options etc) rather than 
being more limited as a web page.

Maybe there are some things web pages can't do though, like take control 
of your microphone, camera, acceleration sensors etc, so you'd need an 
app for them. For example I have a guitar tuner app, not sure if that 
would be possible as a web page. Or the one that allows me to control 
the camera remotely, again not sure a web page could manage that.

> Full HD, on a screen only an inch across. How pointless...
>
> (You realise that the human eye can only focus on objects a certain
> distance away from your face, right? Never mind if you want to see it
> with both eyes simultaneously.)

Most arguments against higher dpi displays forget/ignore the fact that 
images typically displayed are not perfectly anti-aliased. Even images 
from the camera are scaled by some non-optimal algorithm before being 
sent to the display (unsurprisingly Apple's algorithm seemed to be the 
best at this). Image that are computer generated, especially in 
real-time, are likely to have far more aliasing artefacts even with so 
called "AA" features enabled. You've seen how slow POV goes when you use 
"+am2 +r4" - you can't afford to do that (or similar) on a mobile device.

When you have images like this you can *easily* spot the difference 
between a 300 and 600 dpi display at a normal 30 cm viewing distance. At 
my previous job we did lots of testing on this, and the worst image we 
had was something like this, supposedly from a game (not this exact 
image, but it had a lot of aliasing around certain parts of the cars):

http://cdn.digitaltrends.com/wp-content/uploads/2011/10/gran-turismo-5-sema-2009-screenshots-9.jpg

A lot of people could even tell the difference between the 600 and 1200 
dpi version of that one.  600 dpi = full HD on a ~4" phone.

> Oh, I know Facebook is /constantly/ trying to shove stuff like that in
> my face...

Surprising, I thought it detected the device that was requesting the 
webpage and only popped up the message if you were on a phone or tablet 
etc - never seen it on the desktop site.

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