Hello,
did I hear Tech-tree?
That sounds great to me,
and if it is not that much of effort why has it not been done?

I would do it,
but i do not have the knowledge to write that kind of stuff.
If someone would give me the information i need I would be pleased to put it into words or graphical display.
The example from Lithox about the mining is a good one how you can get missled from not knowing.
Another one:
I bought myself some new armory and can not wear it because i am to weak.
If i would have known in the first place I would have not bought it
and invested the money in training first.
Also I would not have to carry it around in my backpack while i am earning the money for training.
About the weapons the same,
a simple longsword can not be held by a enki without the right strength.
One solution would be that the Selling-NPC checks the players stats and display the information
whether the player can use the item or not in a warning window before the sale.
(Just like the salesman in Real Life asks you whether you REALLY want to wear the red shirt with a blue tie at your sisters wedding)

But that would be a greater change of the game, i think.
Which leads me to another thing,
i remember that it was talked about to install something like a store-NPC.
Are there any plans to do so?
Greetings Markus