@ Paradoxical: thanx for my first karma point
I appreciate it.
I think you are missing my point. The scholars toiling away in the 'Tech Labs' (Mind you, I think thats a bad name for them) don't 'unearth' anything. They re-discover the location and then pass that knowledge in to you the Soveriegn incarnate. At that point it appears on the map.
Well to speak frankly I did try to justify the system with a similar reasoning. I did state in my original post that I can accept the odd lair being "dug up", or re-found or something.
But... it takes a damn lot of "imaginative effort" to explain everything this way. I can't accept to be able to SAFELY journey through the land in the first part of the game, when I know that those same lands are populated by hordes of ravaging monsters, including dragons. 
Monsters that my scholars conveniently "make appear" at level 3, then at level 4, then 5, then 6 and so on!
This is 4th wall breaking, if you're into movies-theater metaphors.
And how do you explain champions, by the way? Do scholars find documents that describe how to find level 5 heroes roaming aimlessly, then a document explaining how to find level 6 hero and so on? Come on, let's be real. It's a just a poor design choice.
And even if I could accept such a background (I cannot... it really feels wrong to me), the tech tree could still use some interdependencies. That's how research works, really. No progress can be made, in ANY field, without the help of discoveries in OTHER fields. This makes the tree completely lifeless and mechanical, to me.
Oh. Maybe I did purchase the wrong game, after all.
Many games of the past got this aspect perfectly: I am surprised there's need to argue about it at all...