The thing is on pre-NES consoles most games were arcade ports of very simple games that dealt with single screens at a time, were score focused, and didn't have much depth. The entire gameplay was always focused on a single addicting mechanic for a high score or competing with another player in the same mechanics. There is a completely transformative difference for the type of games that came out on NES (and Sega systems, and MSX, and etc) vs what came before.
I like to think of the line as being Super Mario Bros, but Namco was even earlier with Pac-Land in arcades and Capcom was right on point with Makaimura coming out around the same time as SMB. It was the technology of the era that drove games to be more complicated + interesting and the 1985 line in that sense is just really hard for me to cross back over. This idea of longer games that exist outside of the narrow box of your screen and outside of one sitting, games that scroll through big worlds or games that can persist data across play sessions, games that are about more than just competing with another player but interacting with a game world are what matter to me. The explosion of game genres after 1985 is really a result of the improving technology and the NES just happened to have the right mix of technology at the right time to be the first platform for many groundbreaking and long-running game series.
I don't really know how you can like SNES or Genesis and not like what's on tap for NES. Sure, developers got better at making games, the resources they had were better in terms of storage space, system speed, sprite limits, color, and so on, but fundamentally the types of games you got were pretty similar.