It is interesting to see that some of the game companies use old game designs, apply them a new skin and make a profit out of it. Although some games require having old assets due to efficiency, some just did it on purpose to save cost and budget.
Game Example:
Farcry: Primal
This is an action-adventure game developed by Ubisoft Montreal. Different from the previous game, this game is set back in the pre-historic era where mammal and other beasts exist. However, if you look at the map(on the right side), you will see a familiar layout comparing to Farcry 4. The gameplay is fine, but having the same map layout kind of throws the game a bit.