I just bought my first Master System a few days ago and with the first back of games, I totally see what you mean. The grid design is alright but what the hell is with the minimalistic art? Boy sega sure made a lot of bad choices back in the day.
The other big problem is that the spines don't match up, and they are not unified. Considering how relatively small the master system library is, I don't see why we don't have a custom spine standard for covers like the NES has. Is it just that nobody here collects Master System games?
I'd like to see that happen, a standardized master system spine for custom cases. There are a lot of Europeans here, and the Master System flourished over there, so why no SMS love?