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the dock has a low end on board gpu so it can directly display video out. it does not connect to your dedicated gpu 

With no clue where in the world you are, not able to guess from here.  Search for a local repair shop. Other than that, most of your details don't make much sense.  The fact that only 7 GB of the 16 GB "is working" is...

the monitors aren't what allows 4 separate and different screens at once ... that is a feature of the graphics card.  if your friend didn't make this clear, he isn't knowledgeable enough to be advising you.  Four separate monitors usually...

Sure, it sounds good, for chump change.

Possibly it's because you're getting the newest, hottest devices.  If you get something that's a year old, it's more likely that the kinks have been worked out of the product.

Computer technology advances incredibly fast every year, even every month. So, it is impossible to make this comparison. The technology is now very advanced, and more affordable in price than 20 years ago. (at that time, things that are popular today...

Best gaming laptops is dell ,asus ,acer etc

damaged pixels cannot be "repaired". i know it seems like a minor issue, but they are not so easy to fix. you're better off getting a new screen...