I’ve been playing Like a Dragon Gaiden: The Man Who Erased His Name and I’m in love. This feels like a perfect bridge between Yakuza 6 and Like a Dragon. The play styles for fighting feel really clean and are actually fun, compared to some of the fight styles in earlier games.
I don’t know about spoiling enjoyment per se, but I do recommend at least playing 6. It sounds like you’ve already gotten through the early games. Are you enjoying yourself, or are you burning out on it?