I've played three games now, post NFP, and in each instance I've yet to see a single major Civ construct Flood Barriers (I give CSs free FBs @ the Atomic Age). Even far into the Information Age and their entire coastline including infrastructure having sunk into the depths, I don't see any city with them. Afaicr, the AI would somewhat frequently build them pre-NFP. It just seems like now they don't care and instead build irrelevant items. So I was thinking of giving them a Favored Item to see if that'll help, but wanted to gauge first if anyone else has noticed this behavior post-NFP or if my data set has just been too limited.