Sisiutil said:
So what exactly is your tech trading limit? I myself have yet to see the "too advanced" message. I usually get a tech lead and stop trading by mid-game.
No one seems to have figure this one out yet.
The following are known:
1) It depends on your rank - lower rank gets to trade more
2) Tech Trade limit is influence by AI profile - hence not all happens at the same time but usually soon after one happens
3) You get to see it a lot more often at higher levels due to lower limit
4) If an AI is friendly, there is no limit
5) The limit is on the number of tech receive, not number of trade (I.e., if you get two tech in one trade, that counts as two, not one)
6) There seems to be a decay or increase in limit as time passes. So, one can trade a tech or two after some time. But that will almost certainly close the tech trade option again.
7) It is said that the AI-AI trade is affected by similar limits, though since they are on noble level all the time, this limit may be less than yours if you are playing a higher difficulty level.
That is all I am aware of from reading various post around in this forum and self experience.