Many big developers like Bethesda say that the game can be improved forever and you have to stop and accept your work in time. I also think, but sometimes improvements or revisions are vital, you will learn about this either from your comrades or over time. By the way, after a long development, I begin to dislike some aspects of the game, but I understand that starting to change I will spend months.
Before – After

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After

Before

After

Source: Indie DB