Yeah the 7800 library was basically a bunch of ports of early 80s arcade games that GCC had done for the initial 1984 release date, then ports of whatever computer or arcade games the Tramiels could get cheap licenses for, done by external contractors. Their strategy with the 7800 was competing with Nintendo on price rather than the quality of the game library. Tramiel led Atari wasn't willing to put a bunch of money and effort into pushing video games forward like Nintendo was, they were mainly focusing their internal efforts on the ST computers.