I rather liked the engineer slot on the waterwheel. The reason being that the WW had a clear use, albeit somewhat a niche one: It was the way riverside cities in flatland areas, usually rich in food and gold, had a chance to get some production up and develop.
Of course the engineer slot isn't crucial for the WW to have this use. WW is almost the only thing riverside cities have going for them, and building a city at a river (as opposed to a tile away) should have things going for it. WW allowed those cities to get off the ground more quickly, creating incentive to build a city along a river, which was good both in my game experience opinion as well as historic consistency.
Smithy is a different deal since it gives a +10%
bonus, which by the renaissance can easily mean 6-8
. WW doesn't scale at all, being a drop in the ocean for bigger cities, and I think as such it well fills a role: Get the city off the ground quick. But to do this, it needs to either give a very significant early
bonus (+5
with engineer often easily doubled early production for me). Or it needs to be very quick to build.
As it is now, WW is about pointless, where I feel it should be pretty much a self-evident first building on a riverside city. I understand moving the engineer away so that slots are not city-placement dependent. But at the very least, the WW should then drop to a cost of 90
and maintenance of 1
.
Another nice side of the engineer slot on WW, IMO, was that it made it possible to leverage a riverside start for a Great Engineer for an ancient wonder.