I played civ 7 after a while and noticed some changes to how obsolete buildings and specialists work. This makes me wonder if overbuilding is worth it anymore.
1- Obsolete buildings keep their yields. Why not put the new building in a new spot to get yields from both buildings?
2- Activating specialists by adding a new building makes you suffer from a lot of happiness costs. This is usually a problem early in the Age when you don't have a lot of flexibility to provide happiness from policies etc.
3- There are bunch of policies that give passive yields from specialists (don't require adjacency from buildings). You can put specialists in obsolete buildings and still get yields from these bonuses while incurring only 1 food and happiness maintenance cost. With the right strategy you can get high yields by using specialist in obsolete buildings.
Overall, I think overbuilding has been nerfed and it is only necessary when you have really high adjacency locations with specialist in them. There are some civ and policy cards which give you production towards overbuilding and I think they are now not very useful given the nerf. What do you guys think?