Brake bleeding

Quite a few on here seem obsessed with bleeding brakes. As the lever, hose, caliper is a sealed system. If there was any way for air to get in, then surely you would also have evidence of fluid loss?? Or am I missing something??
my stripped and polished push-iron http://www.bikeradar.com/forum/viewtopic.php?t=12754286
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if there is already air in there then that is another story.
Bleeding is the last thing that should be done as most issues are set up or users in a hurry.
or just people that have not read the manual and gone blindly in.
also the retailers not providing the pad spacers is another issue.
Parktools :?:SheldonBrown
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and I have fitted more than most on here.
Parktools :?:SheldonBrown
+ some other bikes.
the wear of the pads shouldn't make any difference as the master cylinder will take fluid from the reservoir to compensate for pad wear.
i have never touched the shimano brakes on my 07 trek ex7, the avids on my 6 month old remedy have been done once. front lever coming back to the bars on the furthest reach setting.
Thanks for any help..
there is the CPS system (which should be regarded as part of the caliper). contact point no but as you use them the pistons will settle and the movment will become less.
I suggest reading the manual.
Parktools :?:SheldonBrown
EDIT: Seems that the manual refers to this spacer as a "bleed block"...
There is no secret ingredient - Kung Fu Panda
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+ some other bikes.