I've never understood this point of view, especially coming from Konami.
It's quite simple really.
I don't want to hear / watch / play the same story as before.
For me reboot is about exploring different possibilities, not repeating the same story. Especially considering that we had this story for basically like 25 years. I, personally, wanted something different. As soon as I've heard that it was reboot, I wanted it to be different from regular timeline, because for the old story we have old games. And if I want to relive those old stories, I'd better play old games, rather than hope that developers will make another remake / remix / redux of the past story.
To put it simple - if they say "it's a new universe", then I want it to be significantly different. If it retreaded the same ground, I would be dissappointed and consider that authors doesn't have enough guts to change things and approached reboot in a lazy way, making new story in name only. I am fan of experimentations and different aproaches to the old storylines, and I am not getting angry, when I here that anotheer unvierse doing stuff differently. It is natural, the way it should be in the first place.
I think people must treat those things simplier and see possibilities in such things, instead of being angry, that developers changed stuff. It's just a game, not a matter of life and death. And it's not like Castlevania was a literary masterpiece before LOS.
Besides, if LOS wasn't reboot what it would be? Another generic battle between Belmonts and Dracula like CV64? OK, that's a good thing, but would it really stood out with the amount of games with such plot in the series? Maybe. But after all it would be much better, if it was something special. Especially after bunch of Castlevanias with barely relevant and not very interesting stories.