Hi and welcome to the service and forums.
To start with let me say never be scared to post your feedback regarding the service.In my experience as a member here for a few years now meta are one of the few services that actually listen to and act where appropiate on feed back left by it's member base.
They also try where possible to add games to the service that have been requested by members.However you have to bear in mind this is not always possible but at least they try
Whilst i can understand your point of view to have a seperate thread for each specific problem would mean needing multiple threads when they can be covered by one.
Example. When the version of direct x is not corect and an update is needed to resolve the problem it can cuase a lot more than just 1 sypmtom
There can be just a blank screen,no audio,screwed up graphics,nothing appears to happen and many more things so it is easier to have them as they are.You can also be presented with numerous different error messages.Then add the same sort of thing for .netframework 2,3 or 4,then drivers,vcredist etc etc im sure you get the picture.
To have a page for each specific error message would not only be time consuming to create but would bloat the help section of the site to the point where you would need to use a search function and make it more diffucult to navigate.By not spending lots of time creating help posts like that meta have more time to devote to attracting more games for the service.
I understand it can be frustrating when you want to play a game and it wont run but pretty much all the info needed for specific issues can be found by searching the forums.If the help section listed nearly every single possible error it would be huge.In this respect it is no more diffucult to search the forums for the same answer so personally i dont really see the point in duplicating info that is allready available on the service.
If you can't find the info needed after a search then try asking for help on the forums.That is part of the reason they exist and are maintained.There is usually a reply with in an hour or 2.There are regular members like wild,myself and others that take the time and trouble to post helping other members when they have issues.It is probably the fastest way to reolve your issue and not really any different to having it all listed in the help section of the site and needing to search through that.
In fact i'll offar a little feedback to meta about the help section too.
Im not aware of how many members use the forums when they have issues or how often support are contacted but maybe it would be a good idea to have a post in the help section labeled support or further help with a link in them to both support and the forums.