I don't doubt that FAs have brought up the farm system, but I have a hard time believing that they truly care.
What they care about is:
1. The money
2. What their wife thinks
The rest of it is all leverage to get more money. "Hey, your farm system sucks and I want to win long term. You're going to have to up your offer to get me to play there."
And it's not just prospects. They'll use whatever they can. "I don't want to live in Canada." "Your taxes are too high." "I want to play on the west coast."