It may not be a popular opinion, but I think cottages are drastically decreasing the importance of the other improvements. Workshops and Watermills are virtually nonexistant because of the massive commerce of a Town with Printing Press and Free Speech, and the nice extra hammer from Universal Sufferage.
Not only that, you more or less HAVE to use US and FS as civics in the late game to take full advantage of these towns. So not only are they limiting your terrain improvements, but they are also limiting your choice of civics as well.
A more palitable alternative would be allowing other improvements to grow when worked the same way. This would encourage the player to build and work a variety of improvements much the same way they are encouraged to build and work cottages now. It also might give the AI some incentive to build a bit more variety of improvements as well, making them less predictable.
Not only that, you more or less HAVE to use US and FS as civics in the late game to take full advantage of these towns. So not only are they limiting your terrain improvements, but they are also limiting your choice of civics as well.
A more palitable alternative would be allowing other improvements to grow when worked the same way. This would encourage the player to build and work a variety of improvements much the same way they are encouraged to build and work cottages now. It also might give the AI some incentive to build a bit more variety of improvements as well, making them less predictable.