When I ask someone in person they always tell me they would play for like 30 minutes with friends then go outside. I feel the exact same way as someone who loves old games. I cannot pick up an atari game for more than like 20 minutes tops.
Is this just nostalgia? I know these games were all you had at the time but they really just kinda.. Boring? I completely understand that that is really all they could fit on a cartridge at the time but that doesn't change the facts that the games get boring very fast. This is from someone who grew up around n64 era and even then i find myself struggling to play a lot of n64 era games.
Different people may have different preferences and tastes in things. Playing a specific old game may be nostalgic for someone, but for others, it might be comforting, or maybe some other reason. I might not understand it, but I don't have to, but you just have to respect it and let them enjoy what they like. I undoubtedly have my own idiosyncratic gaming selections that others may or may not align with.