I used to always farm riverside hills, they were my favorite tile in the game with the 2F2H1G yield under Civil Service.
Nowadays, I almost never farm them, I usually always mine them.
What happened?
I started playing more lean as I moved up past immortal to deity - selling more resources for gold, expanding more aggressively, growing faster - which made me always push my happiness as low as I could get away with, usually hovering just below or above the 0 mark as the yield of surplus happiness beyond 0 is very minimal (infrequent golden ages, one Piety policy for some minor culture - I think that is it?).
As a result of this, I find myself switching what tiles I'm working in the city a lot to maximize hammers when unhappy (since the growth penality is so huge when unhappy it is often best to max hammers as long as you don't starve the city) and maximizing growth when happy (working riverside farms, triggering We love the king day etc).
A farmed hill, being a balanced yield tile, is very inflexible in this situation and give me little opportunity to micromanage my city, hence I've stopped making farmed hills for all but my most food-starved cities and the result have been much, much better.
Specialization in general (techs, units, city focus etc) has raised my level of play a lot - focusing hard on one advantage seems to be a way to get ahead of a cheating AI at higher difficulty levels. IMHO, balanced approaches are rarely OP enough to overcome the odds stacked heavily against you at Immortal and up.
Nowadays, I almost never farm them, I usually always mine them.
What happened?
I started playing more lean as I moved up past immortal to deity - selling more resources for gold, expanding more aggressively, growing faster - which made me always push my happiness as low as I could get away with, usually hovering just below or above the 0 mark as the yield of surplus happiness beyond 0 is very minimal (infrequent golden ages, one Piety policy for some minor culture - I think that is it?).
As a result of this, I find myself switching what tiles I'm working in the city a lot to maximize hammers when unhappy (since the growth penality is so huge when unhappy it is often best to max hammers as long as you don't starve the city) and maximizing growth when happy (working riverside farms, triggering We love the king day etc).
A farmed hill, being a balanced yield tile, is very inflexible in this situation and give me little opportunity to micromanage my city, hence I've stopped making farmed hills for all but my most food-starved cities and the result have been much, much better.
Specialization in general (techs, units, city focus etc) has raised my level of play a lot - focusing hard on one advantage seems to be a way to get ahead of a cheating AI at higher difficulty levels. IMHO, balanced approaches are rarely OP enough to overcome the odds stacked heavily against you at Immortal and up.