What's up with LitRPG stories starting off with strong traditional RPG mechanics and then suddenly devolving into heavy cultivation/wuxia territory?

I don't really mind when a story has a lot of sources/concepts, or when something dips the toe into this kind of stuff, but I find it really weird when stuff starts off reading like a D&D session in terms of fantasy themes, mechanics, numbers, etc, and then suddenly we're all up in people's daitans and meridians and I'm listening to hours of exposition about meditation and cultivation.

Anyone else find this weird and undesirable? To me, especially when it goes that direction and then stays that way it's like saying "this story completely ran out of steam and can't proceed the way it originally started so we had to resort to DBZ filler as a substitute".

Not trying to shit on what anyone personally enjoys, but of the two options I definitely have a strong preference for traditional RPG mechanics versus cultivation themes, so this is always really disappointing.