I don't really understand when people find more of a good game to be boring. It's ok to take a break if you're tired of the formula or whatever but I dunno

To me it seems like saying "oh no, not another delicious steak today, I couldn't possibly"

I guess people just prefer more novelty than I do?

People gotten used to the idea of "Same as existing but more/small additions" should actually be a DLC/addon, not worthy of incrementing the number and being a successor. For those, you need to completely change the entire thing to something else, then people are fine, and it's a hit/miss if the existing players like it.

Otherwise people feel like the parent, that it's just slightly different than before but incrementally improved, and should therefore be a DLC.

Would you say the same about more obviously artistic mediums? "Oh, their second album sounds exactly like their first which I liked!" isn't a compliment, usually.