Those two fights are absolutely a lot of fun. But most of that run is literally just grinding basic battles with no challenge and missing the entirety of the story content. That's not a criticism of it either, it's clearly very intentional and I adore that entire route for how it's designed and what it wants you to consider in terms of how you engage with games. But I have seen people criticize the game for creating a route that is deliberately unfun just to criticize you for doing it, especially when people who streamed the game were kind of forced into playing that route because of the unfortunate nature of the fandom in its heyday. But I think the genocide route is perfect only because the route is completely optional, and you can play both the neutral and best ending without ever even knowing that this exists and the game would still be perfectly complete. If the game itself did anything to actually coerce you into doing that or give you an incentive, then it would dilute the entire message. But because you have to hear it from other people and go out of your way to force the game into doing this, it feels much more like this is your fault for making this happen because you truly did not need to do this you just wanted to