Does it annoy you when companies don't show the internals of electronics ?

I absolutely LOVE it when companies show the inside of their components!  Even though I have no Earthly idea what any of the parts do, I still get excited when I see the inside.  Favorites include my new Denafrips Gaia and Venus II DAC combo and my Parasound JC2BP and JC5 preamp and amp combo.  The Denafrips has loads of resistors and capacitors and that seems pretty important.  Parasound always has their insides proudly displayed and I can tell you they sound fantastic.

No.  Not at all.  I find that if one is willing to exert the energy, they can usually find photo shots of the internals.  So, irrelevant to me whether or not the manufacturer wants to provide the same.

A lot of companies like to charge real high prices for pretty boxes they do not want to show the inside for many and obvious reasons the biggest being that you will be held accountable when someone calls you out on the build quality.

Lots of failure points ..

The Denafrips has loads of resistors and capacitors and that seems pretty important.  

Look at the care Luxman takes with the wiring of their integrated amps and you can guess the same level of care was applied to the rest of the product. If the wiring of a competitors integrated amp looks like it's spaghetti that's likely a tell.about the rest of its composition. Which would you bet on for reliability for example. 

As an analogy, if you are doing any home remodeling and you see the electrical systems looks like a mess in a similar fashion, it would be surprising the rest of the homes construction was not of the same poor quality. That's not to say the power at the outlets didn't work the same for either a neat or a sloppy wiring system when you plug in your vacuum cleaner. 

Mike