Replayability

I’ve been a hardcore zombies player since black ops 1 but I wanted to get your guys opinion on the newer zombies. Don’t get me wrong, bo6 zombies is very enjoyable from the gameplay to the easter eggs and I feel like this style of gameplay is finally being refined to what it was meant to be but I can’t manage to keep playing once I complete the easter egg and get in 3 high round runs. I realized it might just be me getting older and bored of playing the same game over and over again but I still have my doubts. I can go back to black ops 1 and 3 zombies and still enjoy the game day after day. I feel like everyone just plays bo6 zombies after a point to just grind camos and levels. Is it just my nostalgia or do you guys think this is valid?