Comment to 'Resize image in timeline'

Maybe I'm going to say something stupid, but are not the pictures printed on the fly when the display is so that the resolution is always acceptable?
If you look at the sys_transcoder_filters table you will see the following values:

bx_timeline_photos_preview	Resize	a:3:{s:1:"w";s:3:"100";s:1:"h";s:3:"100";s:13:"squ...	0
bx_timeline_photos_view	Resize	a:3:{s:1:"w";s:3:"300";s:1:"h";s:3:"300";s:13:"squ...	0
bx_timeline_photos_medium	Resize	a:3:{s:1:"w";s:3:"600";s:1:"h";s:3:"600";s:13:"squ...	0
bx_timeline_photos_big	Resize	a:2:{s:1:"w";s:4:"1200";s:1:"h";s:4:"1200";}

So I wonder if there is not a new way of working by transcoding an image based on demand and a specific case from a single photo, instead of storing different formats as you think.
I think it's so in dolphin, but in dolphin if you display the thumbnails 100% on a big screen it becomes really ugly, because it is precisely a miniature of 250 x 250 and that one "pulls" on it for enlarge.
But maybe I'm wrong completely.